2a(3次方减3b的二次方)加(负b的二次方加a的三次方)?
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2a(3次方减3b的二次方)加(负b的二次方加a的三次方)
=2a3-6b2-b2+a3
=3a3-7b2
2(7m减3n)减(8m减5n)
=14m-6n-8m+5n
=6m-n
5(2x减7y)减3(4x减10y)
=10x-35y-12x+30y
=-2x-5y,7,2a(3次方减3b的二次方)加(负b的二次方加a的三次方)
=2a³-3b²-b²+a³
=3a³-4b²;
2(7m减3n)减(8m减5n)
=14m-6n-8m+5n;
=6m-n
5(2x减7y)减3(4x减10y)
=10x-35y-12x+30y
=-2x-5y;,1,2a(3次方减3b的二次方)加(负b的二次方加a的三次方)
2(7m减3n)减(8m减5n)
5(2x减7y)减3(4x减10y)
先去括号,再合并同类项
=2a3-6b2-b2+a3
=3a3-7b2
2(7m减3n)减(8m减5n)
=14m-6n-8m+5n
=6m-n
5(2x减7y)减3(4x减10y)
=10x-35y-12x+30y
=-2x-5y,7,2a(3次方减3b的二次方)加(负b的二次方加a的三次方)
=2a³-3b²-b²+a³
=3a³-4b²;
2(7m减3n)减(8m减5n)
=14m-6n-8m+5n;
=6m-n
5(2x减7y)减3(4x减10y)
=10x-35y-12x+30y
=-2x-5y;,1,2a(3次方减3b的二次方)加(负b的二次方加a的三次方)
2(7m减3n)减(8m减5n)
5(2x减7y)减3(4x减10y)
先去括号,再合并同类项
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