Several problems of merging similar items in grade one of junior high school ①n-{n-2+[5m-3(n+2m)+6n]}+2n ②½x-2（x-1/3y²）+（-3/2x+1/3y²） ③2（t²-t-1)-(t²-t-1)+3(t²-t-1) ④-5（2m-n)-6(2n-3m) ⑤-3（ab-5b²+2a²）-3（7ab+1ba²-25b²）

①n-{n-2+[5m-3(n+2m)+6n]}+2n=n-{n-2+[5m-3n-6m+6n]}+2n=n-{n-2+[3n-m]}+2n=n-{4n-2-m}+2n=n-4n+2+m+2n=2-n+m②½x-2（x-1/3y²）+（-3/2x+1/3y²）=½x-2x+2/3y²-3/2x+1/3y²=½x-2x...

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1. 20 exercises of merging similar items of rational numbers
2. If the side length of the triangle ABC is a, B, C, the square of a + the square of B + the square of C + 338 = 10A + 24B + 26c, try to judge the shape of the triangle
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5. one Scientific experiments show that the charge of the nucleus and electron in the atom are two opposite charges. Physics stipulates that the charge of the nucleus is positive, and the charge of the nucleus and electron in the hydrogen atom is one charge each. The charge they carry is expressed by positive and negative numbers. I know about positive and negative numbers, but I don't know about nucleus, electron and charge
6. The problem of finding the absolute value of mathematics in the first volume of the seventh grade 1. If the absolute value of a is equal to 2 and B is equal to 1, then the absolute value of a + B is? 2. The detection results of some football are negative 25, positive 10, negative 20, positive 30, positive 15, negative 40, which football is of good quality, and use the knowledge of absolute fat to explain. 3. It is known that A.B is a rational number, and / 3a-1 / + / 2b-5 / = 0, you can find the value of a and B according to the definition of absolute value 4. / A-1 / equals 4, then a is equal to?
7. There are strict regulations on the quality of football used in formal football matches. The following are the quality test results of six football matches (use positive numbers to record the grams that exceed the specified quality, and use negative numbers to record the grams that are less than the specified quality): - 25, + 10, - 20, + 30, + 15, - 40
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11. How to combine the similar items in the first grade of junior high school 1. When m = (), the algebraic expression 2x & sup2; - MXY + & frac34; X contains no XY term 2. The taxi charge standard of a city is: the starting price is 4 yuan, and the price per kilometer after 2 kilometers is 1.2 yuan. How much yuan should Zhang Liang pay for a kilometer? (expressed in algebraic formula) 3. Dividing by a number that is not zero is equal to multiplying by the reciprocal of the number? I'm a student of grade one in junior high school. I'm very dizzy about the merging of similar items in mathematics
12. The problem of combining similar items and removing brackets in mathematics of grade one in junior high school Known: | x-y-3 | + (a + B + 4) &# 178; = 0, find [(X-Y) &# 178; - 3 (Y-X)] / [2A + 2B - (a + b)]
13. Ask a few exercises about removing brackets and merging similar items in mathematics of grade one in junior high school~ Must copy the original title, talented prawns help me acridine 1: Remove the brackets and merge the similar items: （1）a+（-b+c-d）（2）a-(-b=c-d)（3）-(p+q)+（m-n）（4）（r+s）-（p-q）（5）3（2xy-y）-2xy（6）a+（5a-3b）-（a-2b）（7）x+[x+(-2x-4y)]（8）1/2（a+4b）-1/3（3a-6b）(9)a+(2a-3c) （10）6x+2（x+3）（11）3x-（4y-2x）+y（12）（2x-2y）-（2y-3x）（13）（x-y）-2（x-3x-2y） 2: According to the rule of removing brackets, the__ Fill in "+" or "-" （1）a __ （-b-c）=a-b+c （2）a __ （b-c-d）=a-b+c+d （3）__ （a-b）__ （c+d）=c+d-a+b 3: Mr. Zhang asked the students to calculate "the value of the algebraic formula A & sup2; + a (a + b) - 2A & sup2; - 2b when a = 0.25 and B = - 0.37." Xiao Ming said that the result can be obtained without any conditions. Do you think what he said is reasonable? Give the reasons 4: First simplify, then find the value of the algebraic formula: (3a-5b) - 2 (3a-b), where a = - 2, B = 3
14. The problem of merging similar items in grade one of junior high school, Remove the brackets and merge the same items x+(2x-1)-(x/3+3) 1 / 2 (square of X-Y) + 1 / 3 (square of X-Y) + 1 / 6 (square of X + square of Y)
15. First factorize, then evaluate 3A (2a & sup2; - 4A + 3) - 2A & sup2; (3a + 4), where a = - 2
16. 3x & sup3; + 2x-5,4x & sup2; - 4x-1, a & sup3; - 3A & sup2; B + 3AB & sup2; - B & sup3;, factorization,
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18. Factorization: A & sup2; + 2Ab + B & sup2; - 3a-3b-4
19. Factorization: A & sup2; - 2Ab + B & sup2; - 3A + 3b-10
20. Factorization A & sup2; - 2Ab + B & sup2; - 3A + 3b-4