(1) 15+3(1-a)-(1-a-a²)+(1-a+a²-a³)(2)(4a²b-3ab)+(-5a²b+2ab)(3) (6m²-4m-3)+(2m²-4m+1)(4) (5a²+2a-1)-4(3-8a+2a²)(5) 3x²-[5x-(½x-3)+2x²]

问题描述:

(1) 15+3(1-a)-(1-a-a²)+(1-a+a²-a³)
(2)(4a²b-3ab)+(-5a²b+2ab)
(3) (6m²-4m-3)+(2m²-4m+1)
(4) (5a²+2a-1)-4(3-8a+2a²)
(5) 3x²-[5x-(½x-3)+2x²]

1.原式=15+3-3a-1+a+a²+1-a+a²-a³=18-3a+2a²-a³2.原式=4a²b-3ab-5a²b+2ab=-a²b-ab3.原式=6m²-4m-3+2m²-4m+1=8m²-8m-24.原式=5a²+2a-1-12+32a-8a²...