化简求值:-a(a²-2ab-b²)-b(ab+2a²-b²),其中a=三分之一,b=二分之一(2)【(-3mn)²m³-2m²(3mn²)³×二分之一n】÷(-3m²n)²,其中m=10,n=-1不要用:^
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![化简求值:-a(a²-2ab-b²)-b(ab+2a²-b²),其中a=三分之一,b=二分之一(2)【(-3mn)²m³-2m²(3mn²)³×二分之一n】÷(-3m²n)²,其中m=10,n=-1不要用:^](/uploads/image/z/971238-30-8.jpg?t=%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%EF%BC%9A-a%28a%26%23178%3B-2ab-b%26%23178%3B%EF%BC%89-b%28ab%2B2a%26%23178%3B-b%26%23178%3B%EF%BC%89%2C%E5%85%B6%E4%B8%ADa%3D%E4%B8%89%E5%88%86%E4%B9%8B%E4%B8%80%2Cb%3D%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80%EF%BC%882%EF%BC%89%E3%80%90%EF%BC%88-3mn%EF%BC%89%26%23178%3Bm%26%23179%3B-2m%26%23178%3B%EF%BC%883mn%26%23178%3B%EF%BC%89%26%23179%3B%C3%97%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80n%E3%80%91%C3%B7%EF%BC%88-3m%26%23178%3Bn%29%26%23178%3B%2C%E5%85%B6%E4%B8%ADm%3D10%2Cn%3D-1%E4%B8%8D%E8%A6%81%E7%94%A8%EF%BC%9A%5E)
化简求值:-a(a²-2ab-b²)-b(ab+2a²-b²),其中a=三分之一,b=二分之一(2)【(-3mn)²m³-2m²(3mn²)³×二分之一n】÷(-3m²n)²,其中m=10,n=-1不要用:^
化简求值:-a(a²-2ab-b²)-b(ab+2a²-b²),其中a=三分之一,b=二分之一
(2)【(-3mn)²m³-2m²(3mn²)³×二分之一n】÷(-3m²n)²,其中m=10,n=-1
不要用:^
化简求值:-a(a²-2ab-b²)-b(ab+2a²-b²),其中a=三分之一,b=二分之一(2)【(-3mn)²m³-2m²(3mn²)³×二分之一n】÷(-3m²n)²,其中m=10,n=-1不要用:^
-a(a²-2ab-b²)-b(ab+2a²-b²),其中a=三分之一,b=二分之一
=-a³+2a²b+ab²-ab²-2a²b+b³
=-a³+b³
=-(1/3)³+(1/2)³
=-1/27+1/8
=(-8+27)/216
=19/216
【(-3mn)²m³-2m²(3mn²)³×二分之一n】÷(-3m²n)²,其中m=10,n=-1
=(9m的4次方n²-9m的5次方n的7次方)÷(9m的4次方n²)
=1-mn的5次方
=1-10×(-1)的5次方
=1+10
=11