求1-2a/3-3a-1/2-3-a/4的值,其中a=-12

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求1-2a/3-3a-1/2-3-a/4的值,其中a=-12

求1-2a/3-3a-1/2-3-a/4的值,其中a=-12
求1-2a/3-3a-1/2-3-a/4的值,其中a=-12

求1-2a/3-3a-1/2-3-a/4的值,其中a=-12
原式=[4(1-2a)-6(3a-1)-3(3-a)[/12
=(4-8a-18a+6-9+3a)/12
=(-23a+1)/12
=277/12

(4a^2-3a)+(2+4a-a^2)-(2a^2+a-1)
=4a^2-3a+2+4a-a^2-2a^2-a+1
=2a^2+3
=8+3
=11
1/2(a-a^2+1-4a^3)-3/2(-a+7a^2-2a^3)
=1/2a-1/2a^2+1/2-2a^3+3/2a-21/2a^2+3a^3
=1/2+(1/2a+3/2a)-(1/2+21/2a^2)a^2+(3a^3-2a^3)
=1/2+2a-11a^2+a^3