(-4a^3+a^2-5a+2)-(-3a^3-2a^2+2a-1)+(3a^2-a+2)先化简再求值

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(-4a^3+a^2-5a+2)-(-3a^3-2a^2+2a-1)+(3a^2-a+2)先化简再求值
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(-4a^3+a^2-5a+2)-(-3a^3-2a^2+2a-1)+(3a^2-a+2)先化简再求值
(-4a^3+a^2-5a+2)-(-3a^3-2a^2+2a-1)+(3a^2-a+2)先化简再求值

(-4a^3+a^2-5a+2)-(-3a^3-2a^2+2a-1)+(3a^2-a+2)先化简再求值
(-4a^3+a^2-5a+2)-(-3a^3-2a^2+2a-1)+(3a^2-a+2)
=-4a^3+a^2-5a+2+3a^3-2a^2-2a+1+3a^2-a+2
=(-4a^3+3a^3)+(a^2-2a^2+3a^2)+(-5a-2a-a)+(2+1+2)
=-a^3+2a^2-8a+5