因式分解求解! 共13題?

w1 = x(x+3-2x+5) = x(-x+8)

w2 = x(t+3-2y+3) = x(t-2y+6)

w3 = (x+1)(3x+8-2x+7) = (x+1)(x+15)

w4 = x^2-x-12 = (x-4)(x+3)

w5 = 2x(x-3)-a(x-3) = (x-3)(2x-a)

w6 = 2ay(y+1) + (y+1) = (y+1)(2ay+1)

w7 = 2x(3y-2) - 3(3y-2) = (3y-2)(2x-3)

w8 = 2m(x-y) + 5(x-y) + 8n(x-y) = (x-y)(2m+8n+5)

w9 = x(a-b) + 2c(x+y) + y(a-b) = (a-b)(x+y) + 2c(x+y) = (x+y)(a-b+2c)

w10 = 5(x^2-25) = 5(x+5)(x-5)

w11 = 9y^2/4 - 1/25 = (3y/2 + 1/5)(3y/2 - 1/5)

w12 = (0.2y + 0.5)(0.2y - 0.5)

w13 = (a+2b+2c)(a+2b-2c)