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If you multiply three numbers, what do you multiply first, and multiply three numbers in the same place; or if you multiply? First, and then multiply? Again, what do they have? What is multiplication
Commutative law of multiplication. Commutative law of multiplication is a kind of operation law of multiplication. The main formula is ab = BA (note that in multiplication and numbers, the multiplication sign is denoted by ·, column: a · B = B · a or: ab = BA). It can change the operation order of multiplication. In daily life, commutative law of multiplication is not widely used
The product of two true fractions must be less than 1______ (judge right or wrong)
Ba and DC are two true fractions (a, B, C, D are all non-zero integers, and B < A, d < C). Find the product of Ba and DC: BA × DC = BDAC. According to B < A, d < C, we can know that BD < AC, so BDAC is a true fraction. So the answer is: correct
Is it right or wrong to say that the product of multiplication of two true fractions must be less than any one of them?
That's right. The more times the true score, the smaller it is
The selling price of TV sets has been reduced by 10% for two consecutive times. After the price reduction, the selling price of each TV set is a yuan, then the original price of each TV set is a yuan
Suppose the original price is X
X*(1-10%)*(1-10%)=a
X=a/0.81
123456789 times 9 equals ()?
123456789 times 9 equals 1111
Several primary school mathematics problems
I got 60 points. Do you know how many questions Li Yu answered correctly?
Spiders have eight legs, dragonflies have six legs and two pairs of wings, cicadas have six legs and a pair of wings. Now there are 20 insects of three species, 128 legs and 22 wings in total. How many insects are there in each species?
"One hundred steamed buns and one hundred abominations make three more uncontested. The three little abominations are divided into one, and how many big and small monks are there?" these four sentences mean: 100 monks eat 100 steamed buns. The big monk eats three, and the little monk eats one. How many big and small monks are there?
Please write the formula! ~~~~~Who wrote me to chase TA reward points!! ~~~~
I got 60 points. Do you know how many questions Li Yu answered correctly? 20 - (5 × 20-60) / (5 + 3) = 20-5 = 15 spiders have 8 legs, dragonflies have 6 legs and 2 pairs of wings, cicadas have 6 legs and 1 pair of wings
What does two thirds mean
It means to divide the unit "1" into three parts equally and take two of them
Represents the fraction of one number in another
-What is 0.00024 represented by scientific counting?
2.4×10^（-4）
The writing characteristics of one night's work,
"A night's work" is an excerpt from the author He Qifang's "recalling Comrade Zhou Enlai". In the article, the author briefly explains why he was able to witness the premier's work, then focuses on what he saw and heard when accompanying Premier Zhou to review the manuscript, and finally expresses his real feelings, But the content is concrete and substantial. Through careful observation, the author catches the fragments of Premier Zhou's overnight work to reflect Premier Zhou's work style and spiritual quality. In terms of material selection, it has the characteristics of seeing the big from the small and taking the big from the small. (2) the article is simple and unadorned, The main purpose of this text is to select and edit the text, The key point of the text is to accompany Premier Zhou to review the manuscript. This part shows Premier Zhou's lofty quality from two aspects: hard work and simple life, It's mainly in the last two natural sections. It's difficult to clarify the context of the author's emotional development and feel the author's strong feelings in these two natural sections
If BC = 10, ab = 5. (1) prove: △ ABO ≌ △ Edo; (2) find the length of Ao
(1) It is proved that the ∵ quadrilateral ABCD is a rectangle, ∵ ed = CD = AB, ≌ OAB = ≌ 0ed, in △ ABO and △ Edo, ≌ EOD = ≌ AOB (opposite vertex angle) ≌ OAB = ≌ 0eded = AB, ≌ ABO ≌ Edo (AAS) (2) ≌ ABO ≌ Edo, ≌ do = ob, ≌ Ao + Bo = 10, let Ao length x, then Bo length (10-x) ≌ Ao + Bo = 10
RELATED INFORMATIONS
- 1. If several true fractions are multiplied, the result must be better than 1______ (fill in "big" or "small")
- 2. An exercise of computer level 2 C language, 16. The following statement about the use of C language data type is wrong: A. To represent natural numbers accurately, use integer type B. To save data with multiple decimals, use the double type C. If you want to process related data with different types, such as personnel information, you should customize the structure type D. If only true and false logical values are handled, logical types should be used I chose B
- 3. , C = D = the value of a, D, C after the expression Let the values of a and B be 6 and 7 respectively, and point out the values of a, B, C and d after calculating the following expressions respectively （1）c=d=a (2)b+=b (3)c=b/=a (4)d=(c=a/b+15)
- 4. A = 8, the value of expression a > > 2 is?
- 5. The value of expression 16 / 4-2 ^ 5 * 8 / 4mod5 / 2 is () a 14 B 4 C 20 D 2
- 6. Who knows that if the following definition is set: int a = 2, B = 3, C = 4, then the expression with the value of 0 is: There are four options: A.a==1)&&(!b==0) B.a C.a&&b D.a||(b+b)&&(c-a)
- 7. Let a = 3, B = 4, C = 5. (1) a + b > C & & B = = C (2) a | B + C & & B-C (3)! (a > b) & amp; (4)! (x = a) & amp; (Y = b) Write the values of the following logical expressions. Let a = 3, B = 4, C = 5 (1)a+b>c&&b==c (2)a||b+c&&b-c (3)!(a>b)&& ( 4)!(x=a)&&(y=b)
- 8. If a = 6, B = 4, C = 5, then the value of the expression a & & B + C | B = = 2 / C is? Mainly how to calculate!
- 9. 5. We know that a = 7.5, B = 2, C = 3.6, the expression! The value of C > b is________ ? Can you explain for me what C means?
- 10. Let a = true, B = false, C = true, d = false, the following logic operation expression value is true, there is () A. (A∧B)∨(C∧D∨ A) B. (( A∧B)∨C)∧ D C. (B∨C∨D)∨D∧A D. A∧(D∨ C)∧B What do the symbols mean? What do you mean by these two?
- 11. 21 = multiplication of several prime numbers
- 12. How many prime numbers are multiplied by 57? Such as the title
- 13. The product of multiplication of two true fractions must be () A. True fraction B. false fraction C. uncertain
- 14. The original price of a kind of clothing is 120 yuan, but now the price is reduced by 20%. What's the current price
- 15. Fill in the appropriate conditions according to the formula. The original price of a garment is 120 yuan. What is the current price? （1）（?）：120×85％ （2）（?）：120÷（1＋1/4）
- 16. The length of a steel wire is 24 meters. One third of the total length is used for the first time, and 20% of the total length is used for the second time ）How many meters are used in the two times? (2) How many meters are left? (3) How many meters more do you use the first time than the second time?
- 17. There are 24 boys in class 6.2, 20% less than girls. How many girls are there in class 6.2? How many students are there in the whole class? Please explain the parallel formula
- 18. A number 60% more than a number is 1 / 5 of 8. Find this number
- 19. 2 / 5 of a number is 60. What's 20% of the number\
- 20. 3 mathematical cylinder and cone application problem formula and answer! (1) The copper cone used by my uncle is a cone with a bottom diameter of 8cm and a height of 9cm. If the copper weight per cubic centimeter is 8.9kg, how many kg is the copper cone? (2) there are eight identical columns in the exhibition hall with a height of 9m and a diameter of 1m. Now we need to paint all the columns. If we use 100g of paint per square meter, how many kg of paint is needed? (3) saw a 10 meter cylindrical wood into four sections, Surface area increased by 24 square decimeters, the original volume of this wood is how many cubic decimeters?