This is about the addition and subtraction of integers There is such a problem: find the value of the polynomial y to the second power - 2XY + y + 1 / 2, where x = 10000 is mistaken for 1000, and the result is correct. Can you tell the Dao Li in it? You'll get points if you get it right!

This is about the addition and subtraction of integers There is such a problem: find the value of the polynomial y to the second power - 2XY + y + 1 / 2, where x = 10000 is mistaken for 1000, and the result is correct. Can you tell the Dao Li in it? You'll get points if you get it right!

That must be y = 0

Comprehensive training of addition and subtraction of integral (2)
1. Remove brackets and merge similar items:
①a-（2a-2） ②-（5x+y）-3（2x-3y） ③2a+（a+b）-2（a+b） ④1-（3xy-x）+[-2（2x+3yz）]
2. Calculation:
①-3x²y+2x²y+3xy²-2xy² ②5（a+b）-4（3a-2b）+3（2a-3b）
3. Simplify evaluation (xy-3 / 2y-3 / 2) - (2 / 2x-2 / 1xy + 1), where x = 2 / 3, y = 3 / 4
4. Use the polynomial with X to represent the area of the shadow part as shown in the figure
5. It is known that a = A & # 178; + B & # 178; - C & # 178;, B = - 4A & # 178; + 2B & # 178; + 3C & # 178;, and a + B + C = 0
Find (1) polynomial C (2) if a = 1, B = - 1, C = 3, find a + B = value
6. Three teams planted trees. The first team planted a tree. The second team planted 8 more trees than twice of the first team. The third team planted 6 less trees than half of the second team. How many trees did the three teams plant? And the total number of trees planted by the three teams when a = 100

Can you do me a favor? I'll send you a private letter to help you. Thank you. 1. Remove the brackets and merge the similar items: ① a - (2a-2) = a-2a + 2 = - A + 2 ② - (5x + y) - 3 (2x-3y) = - 5x-y-6x + 9y = - 11x + 8y ③ 2A + (a + b) - 2 (a + b) = 2A + A + b-2a-2b = A-B ④ 1 - (...)

What are the addition and subtraction of integers

Add and subtract corresponding terms

Please give me 10 questions of medium difficulty with similar items and brackets
For example: 4 (y + 1) + 4 (1-x) - 4 (x + y)

1．3ab-4ab+8ab-7ab+ab=______ ．
2．7x-(5x-5y)-y=______ ．
3．23a3bc2-15ab2c+8abc-24a3bc2-8abc=______ ．
4．-7x2+6x+13x2-4x-5x2=______ ．
5．2y+(-2y+5)-(3y+2)＝______ ．
6．(2x2-3xy+4y2)+(x2+2xy-3y2)=______ ．
7．2a-(3a-2b+2)+(3a-4b-1)=______ ．
13．-6x2-7x2+15x2-2x2＝______ ．
14．2x-(x+3y)-(-x-y)-(x-y)＝______ ．
16．2x+2y-[3x-2(x-y)]=______ ．
17．5-(1-x)-1-(x-1)=______ ．
18．( )+(4xy+7x2-y2)=10x2-xy．
19．(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3．
21. Given a = x3-2x2 + x-4, B = 2x3-5x + 3, calculate a + B=______ ．
22. Given a = x3-2x2 + x-4, B = 2x3-5x + 3, calculate a-b=______ ．
23. If a = - 0.2, B = 0.5, the value of the algebraic formula - (| A2B | - | AB2 |) is______ ．
25. Subtract 3m4-m3-2m + 5 from a polynomial to get - 2m4-3m3-2m2-1, then the polynomial is equal to______ ．
26．-(2x2-y2)-[2y2-(x2+2xy)]=______ ．
27. If - 3a3b2 and 5ax-1by + 2 are of the same kind, then X=______ ,y=______ ．
28．(-y+6+3y4-y3)-(2y2-3y3+y4-7)＝______ ．
29. The result of simplifying the algebraic expression 4x2 - [7x2-5x-3 (1-2x + x2)] is______ ．
30．2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( )．
31．3a-(2a-3b)+3(a-2b)-b=______ ．
32. The reduced algebraic formula X - [y-2x - (x + y)] is equal to______ ．
33．[5a2+( )a-7]+[( )a2-4a+( )]=a2+2a+1．
34．-2(3x+z)-(-6x)+(-5y+3z)=______ ．
35．-5an-an+1-(-7an+1)+(-3an)＝______ ．
36．3a-(2a-4b-6c)+3(-2c+2b)=______ ．
37．9a2+[7a2-2a-(-a2+3a)]=______ ．