Multiplication and division of rational numbers The product of a rational number and its opposite number? A sign must be positive, B sign must be negative, C must not be less than 0, d must not be greater than 0

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1. Several multiple choice questions about multiplication and division of rational numbers 1. The wrong one in the following statement is () A. If a number is multiplied by 0, it still gets 0 B. If a number is multiplied by 1, it is still the original number C. A number multiplied by - 1 yields the opposite number of the original number D. the product of opposite numbers is 1 2. If the product of two numbers is negative and the sum is also negative, then the two numbers () A. They are all negative numbers. B. they are opposite numbers C. One positive and one negative, and the absolute value of negative number is larger. D. one positive and one negative, and the absolute value of negative number is smaller 3. If the sum of two rational numbers is zero and the product is zero, then the two rational numbers () A. At least one of them is zero, not all of them. B. both numbers are zero C. It doesn't have to be all zero, but it must be opposite to each other 4. If the product of two numbers is zero, then the two numbers () A. All equal to zero B. at least one is zero C. One is equal to zero and the other is not equal to zero 5. Multiplication of a rational number by its opposite number, product () A. It must be a positive number B. it must be a negative number C. Must not be greater than zero D. must not be less than zero 6. If the product of two rational numbers is less than zero and the sum is greater than zero, then the two rational numbers () A. Opposite sign B. opposite sign, equal absolute value C. The sign is opposite, and the absolute value of negative number is larger. D. the sign is opposite, and the absolute value of positive number is larger
2. Urgent need for English speech "one plus one equals two?"
3. One of the problems in English teaching is devoting too much time to (.) RT A.a written work B.written works C.the written work D.written work
4. If the index is the same, how to calculate the base
5. How to calculate the same base and different index? Is there a formula? Excuse me
6. How to calculate different base and different index Rt. Urgent It's multiplication
7. In mathematics, how to calculate when the index and base are not equal For example: 0.25^2009*4^2010-8^100*0.5^300
8. How to calculate two numbers with the same base and different exponent? For example, a * + b * =? A * - B * =? A * × b * =? A * / b * =?
9. The division method of calculating the power of the same base 10^3+(-1/30)^-2*(-600)^0-(13)^3*-3^-1*π^0
10. Several calculation problems, (2) The seventh power of (- 4 / 3) / the fifth power of (- 4 / 3) / 4 / 3= (7) (X & # 179;) &# 179; / the sixth power of X / (- x) &# 178= (8) (the fourth power of a * A & # 179;) &# 178; / (the seventh power of a / the fourth power of a) &# 178= (9) The fifth power of (2a) / (4a & # 179;)= (10) (octave power of a / A & # 179;), # 179; / (quintic power of a / A & # 178;), # 178=
11. 1. The wrong one in the following statement is () The product of a number and zero is zero B a number is multiplied by 1, and the product is still this number The product of a number C with - 1 is the opposite of the number The product of a number multiplied by itself is a positive number 2. If a ● B = a ● B, there must be () A ab＞0 B ab≮0 C a＜0 b＜0 The symbols of D A and B are the same If two rational numbers are multiplied, (1) if one of the factors is replaced by its opposite number, (2) if two factors are replaced by their respective opposite numbers, what is the relationship between the product obtained and the original product? If M and N are rational numbers. And m ＜ n ＜ 0, then (M + n) × (m-n) 0 The rational numbers a, B and C are not zero. In the following cases, it is () A, B and C are the same number B a＞0，2b-3c=0 C a＜0，3b-2c=0 D a＜0，2b+3c=0 Answer today=
12. Note: ^ is the square * is the multiplication sign, known: A.B.C are rational numbers, satisfy: | A-1 | + | B + 5 | + (5c-1) ^ 2 = 0, find the value of (a * b * c) ^ 127 ÷ (a ^ 11 b ^ 3 C ^ 2)
13. The multiplication of rational numbers -1 / 42 * (1 / 6-3 / 14 + 2 / 3-2 / 7) (writing process)
14. How to transform and unify the multiplication and division of rational numbers? Be brief. It's just casual
15. Multiplication and division of rational numbers If the absolute value of a is divided into a + B, B + C, C = 1, what is the absolute value of ABC divided into ABC
16. How to write these three mathematical problems? Multiplication and division of rational numbers in the first day of junior high school (- 3 / 7) × (7 / 3) —80×（—4120）×12.5×0.01 (1 / 2 + 5 / 6-7 / 12) × (- 36)
17. The difference between 4 and its reciprocal is ()
18. What is the reciprocal of the difference
19. If a person hits a target for m times and B for N times, the average number of rings is () A. a+bm+nB. 12(am+bn)C. am+bnm+nD. 12（am+bm）
20. According to the meaning of power and the multiplication rule of fraction, we can get (B / a) ^ 2 = B / a ` B / a = B ` B / a ` a = B ^ 2 / A ^ 2 1. Can you calculate (B / a) ^ n (n is a positive integer), from which you can get the multiplication rule of fractions 2. Calculate (- X / y) ^ 2 '(- y ^ 2 / x) ^ 3 ÷ (- XY ^ 4)