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

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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

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+1
3x-[(y-x)-2x-y]
=3x-[y-x-2x-y]
=3x-y+x+2x+y
=6x