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Seventh grade (next) mathematics unit test where can next
The polynomial - 3 + 2x2y - 13 π x3y2 is a polynomial of degree, and the coefficient of its highest degree is. 2. Please write a binomial of degree three: a binomial of degree two
The last question on page 14 of the seventh grade mathematics class exercise and unit test
One triangle has three matches, two triangles have five matches, three triangles have seven matches, and how many matches are n triangles
2N+1
Because: a triangle has three matches: 2n + 1 = 2x1 + 1 = 3
Two triangles with five matches: 2n + 1 = 2x2 + 1 = 5
.
How much is a number divided by 3 times 8 minus 4.5 plus 8.8 to get 52.3?
52.3-8.8=43.5
43.5+4.5=48
48÷8×3＝18
The number is 18
A home appliance store has shipped a batch of washing machines and color TV sets. The number of color TV sets is three times that of washing machines. Now, an average of 10 washing machines and 15 color TV sets are sold every day. After the washing machines are sold out, there are still 120 color TV sets left unsold. How many washing machines and color TV sets have been sent to the store?
Suppose the washing machine is sold out in X days, 3 × 10x = 15x + 120, 30x-15x = 120, & nbsp; & nbsp; & nbsp; 15x = 120, & nbsp; & nbsp; & nbsp; & nbsp; X = 8, the number of washing machines is 10 × 8 = 80, the number of color TV sets is 15 × 8 + 120, = 120 + 120, = 240
Find the law (11:20:2:22)
Observe the following:
9-1=8；16-4=12；25-9=16；36-16=20····
What is the law of the appeal equation? Please use the algebraic formula containing natural number n to express the law that you have discovered: the law discovered by you: the law discovered by you is the law of the law that you have discovered: the law of the law of the law of the law of the law of the law of the law of the law you found, which contains the natural number n, and the algebraic formula containing natural number n is the algebraic formula of the algebraic formula of the natural number n, which you find the law that you have discovered: the \35\106;; \\3535\35j; \35\\\\\\\\\\\\itis also shown that the #; \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\it's the first time that I've seen it; .
(n+2)²-n=4（n+1）
What is the basis of removing bracket, denominator, shifting items and merging similar items
To say the whole thing!
The basis of removing brackets is: the rule of removing brackets, the law of distribution
The basis for removing the denominator is: the basic properties of the equation
The basis of term shifting is: equality property 1
The basis for merging similar items is that they have the same number or letter
What is the formula for calculating the area of regular polygon?
nsqrt(3)a^2/4
A is the length of the side and N is the number of sides
Sqrt (3) denotes root 3
The original sales profit margin of a commodity was 47%. Now, because the purchase price has increased by 5% and the selling price has not changed, the sales profit margin of the commodity has become 47%___ %[Note: sales profit margin = (selling price purchase price) × purchase price]
Let the original price be x and the original purchase price be y. according to the meaning of the question: x-yy = 47%, the solution is: x = 1.47y; X - (1 + 5%) y (1 + 5%) y = 1.47y-1.05y1.05y = 0.421.05 = 40%; so after the purchase price is increased, the sales profit margin of the commodity becomes 40%. So the answer is: 40%
The original price of a color TV set is 2000 yuan, but now it is reduced by one fifth, which is still 200 yuan higher than the cost. How much is the cost of this color TV set?
Current price = 2000 * (1-1 / 5) = 1600
Cost = 1600-200 = 1400
Given that 3x + 2Y = 44, 2x + 3Y = 46, then x=______ ，y=______ ．
3x + 2Y = 44, two sides of the equation multiply by 2, 6x + 4Y = 88, ①; 2x + 3Y = 46, two sides of the equation multiply by 3, 6x + 9y = 138, ②; ② subtract ①, 5Y = 138-885y = 50 & nbsp; y = 10; substitute y into 3x + 2Y = 44, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 3x + 20 = 44 & nbsp; & nbsp; 3x + 20 = 44-2
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