(1)化简2(a2b-2ab2)-4(ab2-3a2b)+(2a2b-ab2).(2)先化简,再求值4m3-(3m2+5m-2)+2[3m-(-32m
(1)化简2(a2b-2ab2)-4(ab2-3a2b)+(2a2b-ab2).(2)先化简,再求值4m3-(3m2+5m-2)+2[3m-(-32m2-2m3)]-1,...
(1)化简2(a2b-2ab2)-4(ab2-3a2b)+(2a2b-ab2).(2)先化简,再求值4m3-(3m2+5m-2)+2[3m-(-32m2-2m3)]-1,其中m=-2.
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(1)原式=2a2b-4ab2-4ab2+12a2b+2a2b-ab2
=2a2b+12a2b+2a2b-4ab2-4ab2-ab2
=(2+12+2)a2b+(-4-4-1)ab2
=16a2b-9ab2
(2)原式=4m3-(3m2+5m-2)+2[3m+
m2+2m3]-1
=4m3-3m2-5m+2+6m+3m2+4m3-1
=4m3+4m3-3m2+3m2-5m+6m-1+2
=8m3+m+1
当m=-2时,原式=8×(-2)3+(-2)+1=8×(-8)-2+1=-64-2+1=-65
=2a2b+12a2b+2a2b-4ab2-4ab2-ab2
=(2+12+2)a2b+(-4-4-1)ab2
=16a2b-9ab2
(2)原式=4m3-(3m2+5m-2)+2[3m+
3 |
2 |
=4m3-3m2-5m+2+6m+3m2+4m3-1
=4m3+4m3-3m2+3m2-5m+6m-1+2
=8m3+m+1
当m=-2时,原式=8×(-2)3+(-2)+1=8×(-8)-2+1=-64-2+1=-65
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