第1个回答 2014-02-05
(x+5y)-(3y-4x)=x+5y-3y+4x
1/2(x6^2-y)+1/3(x-y^2)+(x^2）（^为平方号）
10a+6b-7a+3b-10a+10b+12a+8b
4xy-2y+3x-xy
(3x-5y)-(6x+7y)+(9x-2y)
2a-[3b-5a-(3a-5b)]
(6m2n-5mn2)-6(m2n-mn2)
(5x-4y-3xy)-(8x-y+2xy)
a-(a-3b+4c)+3(-c+2b)
7x2-7xy+1
6-5b-(3a-2b)-(1-6b)
(5x-4y-3xy)-(8x-y+2xy)
(3x2-4xy+2y2)+(x2+2xy-5y2)
(x-y)2-(x-y)2-[(x-y)2-(x-y)2]
(2k-1)x2-(2k+1)x+3
2(x-2)-3x-2
2y-3y+1-6y
3b-6c+4c-3a+4b
2a-5b+4c-7a+5a+5b-4c
4a+6c+7a-6a+7b-3c-6b
5b+2c-7b+4z-3z
3b+3c-6a+8b-7c-2a
3c-7b+5z-7b+4a-6n+8b-3v+9n-7v
3m2n+6mn2-mn2-m2n
-3x2y+5xy2-6xy2+4-7x2y-9
xy2+(-3x2y)+4xy2+(-5x2y)，
m2+(-mn)-n2+(-m2)-(-0.5n2)
2(4an+2-an)-3an+(an+1-2an+1)-(8an+2+3an)
(x-y)2-(x-y)2-[(x-y)2-(x-y)2]
a-(a-3b+4c)+3(-c+2b)
(3x2-2xy+7)-(-4x2+5xy+6)
3x2-1-2x-5+3x-x2
-0.8a2b-6ab-1.2a2b+5ab+a2b
6x2y+2xy-3x2y2-7x-5yx-4y2x2-6x2y
4x2y-8xy2+7-4x2y+12xy2-4
a2-2ab+b2+2a2+2ab - b2
-4x2y-8xy2+2x2y-3xy2
3x2-1-2x-5+3x-x2
-0.8a2b-6ab-1.2a2b+5ab+a2b
5yx-3x2y-7xy2+6xy-12xy+7xy2+8x2y
3ab-4ab+8ab-7ab+ab
7x-(5x-5y)-y
23a3bc2-15ab2c+8abc-24a3bc2-8abc
-7x2+6x+13x2-4x-5x2
2y+(-2y+5)-(3y+2)
(2x2-3xy+4y2)+(x2+2xy-3y2)
2a-(3a-2b+2)+(3a-4b-1)
-6x2-7x2+15x2-2x2
2x-(x+3y)-(-x-y)-(x-y)
2x+2y-[3x-2(x-y)]
5-(1-x)-1-(x-1)
-2(3x+z)-(-6x)+(-5y+3z)
5an-an+1-(-7an+1)+(-3an)
3a-(2a-4b-6c)+3(-2c+2b)
9a2+[7a2-2a-(-a2+3a)]
(4x2-8x+5)-(x3+3x2-6x+2)．
(0.3x3-x2y+xy2-y3)-(-0.5x3-x2y+0.3xy2)
-{2a2b-[3abc-(4ab2-a2b)]｝
(5a2b+3a2b2-ab2)-(-2ab2+3a2b2+a2b)
(x2-2y2-z2)-(-y2+3x2-z2)+(5x2-y2+2z2)
(3a6-a4+2a5-4a3-1)-(2-a+a3-a5-a4)
4a-2b-c)-5a-[8b-2c-(a+b)
(2m-3n)-(3m-2n)+(5n+m)
(3a2-4ab-5b2)-(2b2-5a2+2ab)-(-6ab)
xy-(2xy-3z)+(3xy-4z)
(-3x3+2x2-5x+1)-(5-6x-x2+x3)
3x-(2x-4y-6x)+3(-2z+2y)
(-x2+4+3x4-x3)-(x2+2x-x4-5)
2m-{-3n+[-4m-(3m-n)]
5m2n+(-2m2n)+2mn2-(+m2n)
4(x-y+z)-2(x+y-z)-3(-x-y-z)
2(x2-2xy+y2-3)+(-x2+y2)-(x2+2xy+y2)
2(a2-ab-b2)-3(4a-2b)+2(7a2-4ab+b2)
4x-2(x-3)-3[x-3(4-2x)+8]