整式:-(2a2-2a)3(3a-a2),
=6a^2(a-1)(a-3)
=6a^2(a^2-4a+3)
=6a^4-24a^3+18a^2
2(4x2y+-5xy2)
=8x^2y+10x^2
,3(2x2-2x-1)-2(2x2-x-7),
=6x^2-6x-3-4x^2+2x+14
=2x^2-4x+11
2a-[-3b-3(3a-b)]
=2a-[-3b-9a+3b]
=2a+9a
=11a
,(1/3a3-2a-6)-1/2(1/2a3-a-7)
=1/3a^3-2a-6-1/4a^3+1/2a+7/2
=1/12a^3-3/2a-5/2
-1/2x+1/3x-x,
=-7/6x
2a+4a-5a-5a+6b,
=-4a+6b
-5x2y+3xy2-2xy2+4x2y,
=-x^2y+xy^2
6a2+2ab+3b2-7a2-4ab-6b2,
=-a^2-2ab-3b^2
(2x-5y)-(2x+4y)
=2x-5y-2x-4y
=-9y
(5a-3b)-4(a2-2b)
=5a-3b-4a^2+8b
=5a+5b-4a^2
2x-(5x-3y)+(-3x-7y)
=2x-5x+3y-3x-7y
=-6x-4y
3a+[4b-(a-3b)],
=3a+[4b-a+3b]
=3a+7b-a
=2a+7b
(2x+y)+(3x-2y)
=2x+y+3x-2y
=5x-y
(5a-2b)-(2a+b),
=5a-2b-2a-b
=3a-3b
2(x2-xy)-3(2xy-y2)
=2x^2-2xy-6xy+3y^2
=2x^2-8xy+3y^2
3a2-2a+4a2-7a,
=a^2-9a
1/2st4+3st
=1/2st^4+3st
2(2ab+3a)-3(2a-ab)
=4ab+6a-6a+3ab
=7ab
a2-[-4ab+(ab-a2)]-2ab
=a^2-[-4ab+ab-a^2]-2ab
=a^2+3ab+a^2-2ab
=2a^2+ab
8m2-[4m2-2m-(2m2-5m)]
=8m^2-[4m^2-2m-2m^2+5m]
=8m^2-2m^2-3m
=6m^2-3m
(8xy-x2+y2)-3(-x2+y2+5xy)
=8xy-x^2+y^2+3x^2-3y^2-15xy
=-7xy+2x^2-2y^2
3(2a-3b)+5(a+b)-4(3a-2b)
=6a-9b+5a+5b-12a+8b
=-a+4b
2a-[3b-5a-(2a-7b)]
=2a-[3b-5a-2a+7b]
=2a+7a-10b
=9a-10b
(2x-3y)+(5x+4y)
=2x-3y+5x+4y
=7x+y
(8a-7b)-(4a-5b)
=4a+2b
3xy-4xy-(-2xy)
=3xy-4xy+2xy
=xy
-1/3ab-1/4a2+1/3a2-(-2/3ab)
=-1/3ab-1/4a^2+1/3a^2+2/3ab
=1/3ab+1/12a^2
(-x+2x2+5)+(4x2-3-6x)
=-x+2x^2+5+4x^2-3-6x
=6x^2-7x+2
(3a2-ab+7)-2(-4a2+2ab+7)
=3a^2-ab+7+8a^2-4ab-14
=11a^2-5ab-7
xy2-1/5xy2
=4/5xy^2
-3x2y+2x2y+3xy2-2xy2
=-x^2y+xy^2