求解(3x+2)(3x-2)-5x(x-1),其x=-3/1如题,
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求解(3x+2)(3x-2)-5x(x-1),其x=-3/1如题,
求解(3x+2)(3x-2)-5x(x-1),其x=-3/1
如题,
求解(3x+2)(3x-2)-5x(x-1),其x=-3/1如题,
首先 化简啊
(3x+2)(3x-2)=9x^2-4
5x(x-1)=5x^2-5x
等式就变成了 4x^2+5x-4 把x=-1/3代入(应该是-1/3吧,怎么可能是-3/1,你是要表达负三分之一么)
得到答案 -47/9
(3x+2)(3x-2)-5x(x-1),其x=-3/1
=9x^2-4-5x^2+5x
=4x^2+5x-4
=36-15-4
=17
x=-1/3
(3x+2)(3x-2)-5x(x-1)
=9x^2-4-5x^2+5
=4x^2+1
=4*(1/9)+1
=13/9
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