3ab-4ab+8ab-7ab+ab
23a3bc2-15ab2c+8abc-24a3bc2-8abc
2y+(-2y+5)-(3y+2)
(2x2-3xy+4y2)+(x2+2xy-3y2)
2a-(3a-2b+2)+(3a-4b-1)
2x-(x+3y)-(-x-y)-(x-y)
2x+2y-[3x-2(x-y)]
5-(1-x)-1-(x-1)
3x-2x2+x-4+2x3-5x+3
3x-2x+x-4-(2x3-5x+3)
-(2x2-y2)-[2y2-(x2+2xy)]
(-y+6+3y4-y3)-(2y2-3y3+y4-7)
4x2-[7x2-5x-3(1-2x+x2)]
3a-(2a-3b)+3(a-2b)-b
x-[y-2x-(x+y)]
3x-[y-(2x+y)]
4a2n-an-(3an-2a2n)
2x2y+3xy2-x2+2xy-(3x2y+2x2-3xy-4)
-5xm-xm-(-7xm)+(-3xm)
[a-(b-c)]-[-b-(-c-a)]
b-2(-5a)]-(-3b+5c)
-2(3x+z)-(-6x)+(-5y+3z)
-5an-an+1-(-7an+1)+(-3an)
3a-(2a-4b-6c)+3(-2c+2b)
9a2+[7a2-2a-(-a2+3a)]
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)
-(2x2-y2)-[2y2-(x2+2xy)]
(-y+6+3y4-y3)-(2y2-3y3+y4-7)
4x2-[7x2-5x-3(1-2x+x2)
3a-(2a-3b)+3(a-2b)-b
(3x-5y)-(6x+7y)+(9x-2y)
2a-[3b-5a-(3a-5b)]
(6m2n-5mn2)-6(m2n-mn2)
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]
-9(x-2)-y(x-5) 5(9+a)×b-5(5+b)×a
62g+62(g+b)-b
3(x+y)-5(4+x)+2y
(x+y)(x-y)
2ab+a×a-b
5.6x+4(x+y)-y
6.4(x+2.9)-y+2(x-y)
(2.5+x)(5.2+y).
2(x3)2•x3－(2 x3)3＋(－5x)2•x7
(－2a3b2c) 3÷(4a2b3)2－ a4c•(－2ac2)
－2a2( ab＋b2)－5a(a2b－ab2)
(3x3－2)(x＋4)－(x2－3)(3x－5)
9(x＋2)(x－2)－(3x－2)2
[(x＋y)2－(x－y2)＋4xy] ÷(－2x)
5a-2b+3b-4a-1
7x²-3x²-2x-2x²=5=6x
2X―[6-2(X-2)]
(5a＋2a²－3－4a³)－(－a＋3a³－a²)
3x²+4x-2x²-x+x²-3x-1
-3[y-(3x2-3xy)]-[y+2(4x2-4xy)]
2x²-3xy+y²-2xy-2x²+5xy-2y+1
2x²y+4x²y-3xy²-5xy²
9x+6x²2 -3(x-2/3x²2)
1/4(-4x²+2x-8)-(1/2x-1)
3x'y-[2x'y-(2xyz-x'z)-4x'z]-xyz
(5a^2-3b^2)+(a^2+b^2)-(5a^2+3b^2)
2(a^2b+ab^2)-2(a^2 b-1)-2ab^2 -2
(3x-5y)+(-3+y)
(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]．
(m+1)-(-n+m)；
4m-[5m-(2m-1)]．
2x2-｛-3x-[4x2-(3x2-x)+(x-x2)]｝．
-(7x-y-2z)-｛[4x-(x-y-z)-3x+z]-x｝．
(+3a)+(-5a)+(-7a)+(-31a)-(+4a)-(-8a)．
a3-(a2-a)+(a2-a+1)-(1-a4+a3)．
x2-8x+2x3-13x2-2x-2x3+3
4x2-3[x+4(1-x)-x2]-2(4x2-1)
(-x+5+2x4-6x3)-(3x4+2x2-3x3-7)．
(x-y)(x+3)
(5a2+8a)+(3a2-7a+5)
(-3)5*(-3)2*3
x2y2*(-x2y)
(2a+3b)(a-b)
(5a3-2a+a2)÷(-2a)
4xy2*(-2x)
我找了一個小時.