作业帮(-0.25)x(-2)x(-5/12)x(+0.8)
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(-0.25)x(-2)x(-5/12)x(+0.8)
(-0.25)x(-2)x(-5/12)x(+0.8)
(-0.25)x(-2)x(-5/12)x(+0.8)
(-0.25)×(-2)×(-5/12)×(+0.8)
=(-1/4)×(-2)×(-5/12)×4/5
=-(1/4×2×5/12×4/5)
=-(1/4×4/5)×(2×5/12)
=-1/5×5/6
=-1/6
(-0.25)x(-2)x(-5/12)x(+0.8)
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
通分:x+4/x^2-8x+15,x-5/x^2+x-12,x-3/x^2-x-20
求1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1 其中x=12/13
求1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1 其中x=12/13
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