Addition and subtraction of rational numbers in the first semester of junior high school This is the second sub problem of the seventh question on page seven of the exercise book of rational number addition and subtraction in the first semester of this year!

You write down the specific content of the title, otherwise how can you solve it without a book

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1. What's the difference between the result of his calculation and the correct answer? What's the difference between the result of his calculation and the correct answer? What's the difference between the result of his calculation and the correct answer when he miscalculated 17 * (M + 0.3) into 17 * m + 0.3? What's the difference between the result of his calculation and the correct answer when he miscalculated 17 * (M + 0.3) into 17 * m + 0.3? What's the difference between the result of his calculation and the correct answer when he miscalculated 17 * (M + 0.3) into 17 * m + 0.3? What's the difference between the result of his calculation and the correct answer when he miscalculated 17 * (M + 0.3) into 17 * m + 0.3, What is the difference between his calculation result and the correct answer? What is the difference between his calculation result and the correct answer?
2. 1. Two numbers with the same absolute value are opposite to each other with different symbols, and one of them is called the opposite number of (). 2 1. Two numbers with the same absolute value are opposite to each other with different symbols, one of which is called the opposite number of (). 2. The opposite number of a number can be preceded by a () sign
3. Given the function f (x) = ax & # 178; + 1 (a > 0), G (x) = x ^ 3 + BX (1) If the curve y = f (x) and the curve y = g (x) have a common tangent at their intersection (1, c), the values of a and B are obtained; (2) When a ^ 2 = 4b, find the monotone interval of F (x) + G (x) - and its maximum value in the interval (- ∞, - 1)
4. 1 find the range of function y = 2x ^ 2 + 6x + 7 2 find the range of function y = 1 / X-2 3
5. When is y = ax = B / CX = D equal to its inverse function If I do it right, I will add 100 Wrong, y = ax + B / CX + D
6. In the triangle ABC, ∠ a = 30 °, AC = 40, BC = 25, find AB (important process) I know the formula, but I don't know the operation of sin, Tan, con and so on. Do me a favor,
7. NBA, BBC and UN
8. The denominator of a simplest fraction is three times larger, and the numerator is two times smaller, which is equal to two ninths of the original fraction
9. If A-B = 10, what is the square of 1-A + B
10. As shown in the figure, in the triangle ABC, D is a point on the edge AB, and ad = AC, De is parallel to BC, CD bisection angle EDF
11. In the football round robin, if the red team wins the yellow team by 4:1, the yellow team wins the blue team by 1:0, and the blue team wins the red team by 1:0, then the net winning goals of the red team, the yellow team and the blue team are () A. 2，-2，0B. 4，2，1C. 3，-2，0D. 4，-2，1
12. Rational number addition and subtraction in junior high school (addition) （-25）+34+156+（-65）=100 （-64）+17+（-23）+68=（-2）（-42）+57+（-84）+（-23）=（-92） subtraction （-3）-（-7）=10 （-10）-3=（-13） 33-（-27）=60 Are these questions right? Addition of rational numbers is the addition of different numbers, the decrease of sign follows the decrease of sign. Subtraction is the opposite of subtracting a number equal to the addition of this number
13. 50 rational number addition and subtraction mixed operation problem + + to answer! Urgent
14. How to calculate the mixed operation of addition and subtraction of rational numbers? Example: 2 1 — + （— —）— 1 + — 3 5 3
15. The general steps of the mixed operation of addition and subtraction of rational numbers are: (1)________ ;(2)_________ ;(3)________ _______ ;(4)__________________
16. Steps of rational addition and subtraction?
17. Mathematical equation of one variable, for example, 5Y = 50 + 4Y, when the solution contains unknowns on the left, how does its sign change when it moves over People's education press grade 7 Volume 1 mathematics Chapter 5 equation of one dollar, because I have to do homework
18. Sign problem of inequality for linear equation of one variable Don't tell me to multiply or divide on both sides 2X-1〈4X+13 2X-4X〈13+1 -2X〈14 How to see X-7? Teach me. I just don't understand the sign. I can do the equation
19. When does a linear equation of one variable change sign When does the equation of one variable change sign, for example, why does (20-x) in 4x-3 (20-x) = 3 change sign
20. What is the law of the sign change of mathematics without bracket in the first volume of junior high school