(1) -8x+6x-x
(2) 4ab-5ab+2ab
(3) 2x²+x-x²-x
(4) 3x²-6+4x-6x-2x²+5
(5) 3a-b+(5a-3b+3)
(6) (2b-3a)-(2a-3b+1)
(7) 4x²+2(x²-y²)-3(x²+y²)
(8) 3(a²-2ab)-(-ab+b²)
(9) -2(2x²-x+4)+3(x²-2x+3)
(10) 4a²+3b²-2ab-3a²+b²还有么、最好有网址这是自己出的。x+5y)-(3y-4x)=x+5y-3y+4x1/2(x6^2-y)+1/3(x-y^2)+(x^2）（^为平方号）10a+6b-7a+3b-10a+10b+12a+8b4xy-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+32(x-2)-3x-2 2y-3y+1-6y3b-6c+4c-3a+4b 2a-5b+4c-7a+5a+5b-4c 4a+6c+7a-6a+7b-3c-6b 5b+2c-7b+4z-3z3b+3c-6a+8b-7c-2a 3c-7b+5z-7b+4a-6n+8b-3v+9n-7v -0.8a2b-6ab-1.2a2b+5ab+a2b； 5yx-3x2y-7xy2+6xy-12xy+7xy2+8x2y