来自蔡虹的问题
【去括号,再化简2(-a³+2a²)-(4a²-3a+1)(4a²-3a+1)-3(-a³+2a²)3x-[(y-x)]-2x-y]】
去括号,再化简
2(-a³+2a²)-(4a²-3a+1)
(4a²-3a+1)-3(-a³+2a²)
3x-[(y-x)]-2x-y]


【去括号,再化简2(-a³+2a²)-(4a²-3a+1)(4a²-3a+1)-3(-a³+2a²)3x-[(y-x)]-2x-y]】
去括号,再化简
2(-a³+2a²)-(4a²-3a+1)
(4a²-3a+1)-3(-a³+2a²)
3x-[(y-x)]-2x-y]
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+13x-[(y-x)-2x-y]=3x-[y-x-2...