已知,a-b=0,求a³-(2a的四次方b³-a²b)-ab²-b³+2a³b四次方的值
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已知,a-b=0,求a³-(2a的四次方b³-a²b)-ab²-b³+2a³b四次方的值
已知,a-b=0,求a³-(2a的四次方b³-a²b)-ab²-b³+2a³b四次方的值
已知,a-b=0,求a³-(2a的四次方b³-a²b)-ab²-b³+2a³b四次方的值
a-b=0,求a立方-(2a四次方b三次方-a平方b)-ab平方-b立方+2a立方b四次方
=a^3-2a^4b^3+a^2b-ab^2-b^3+2a^3b^4
=(a^3-b^3)+(a^b-ab^2)-(2a^4b^3-2a^3b^4)
=(a-b)(a^2+ab+b^2)+ab(a-b)-2a^3b^3(a-b)
=0+0+0
=0