Question

去括号，再化简

2（-a³+2a²）-（4a²-3a+1)

(4a²-3a+1)-3（-a³+2a²）

3x-[(y-x)]-2x-y]
要求详细过程~

Answer 1

2(-a³+2a²)-(4a²-3a+1)
=-2a³+4a²-4a²+3a-1
=-2a³+3a-1
(4a²-3a+1)-3(-a³+2a²)
=4a²-3a+1+3a³-6a²
=3a³-2a²-3a+1
3x-[(y-x)-2x-y]
=3x-[y-x-2x-y]
=3x-y+x+2x+y
=6x