(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