(x+2)(x^2+5x-10)-(x+2)^2(x-1),其中x=1.5
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(x+2)(x^2+5x-10)-(x+2)^2(x-1),其中x=1.5
(x+2)(x^2+5x-10)-(x+2)^2(x-1),其中x=1.5
(x+2)(x^2+5x-10)-(x+2)^2(x-1),其中x=1.5
(x+2)(x^2+5x-10)-(x+2)^2(x-1)
=(x+2)[(x^2+5x-10)-(x+2)(x-1)]
=(x+2)[(x^2+5x-10)-(x^2+x-2)]
=(x+2)(4x-8)
=4(x+2)(x-2)
=4(x^2-4)
将x=1.5代入,得
原式=4×(1.5^2-4)
=4×(2.25-4)
=-7
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