问题 解答题

化简:

(1)(3x2-x+2)-2(x2+x-1)

(2)7a2b-(-4a2b+5ab2)-2(2a2b-3ab2

答案

(1)(3x2-x+2)-2(x2+x-1)

=3x2-x+2-2x2-2x+2

=x2-3x+4;

(2)7a2b-(-4a2b+5ab2)-2(2a2b-3ab2

=7a2b+4a2b-5ab2-4a2b+6ab2

=7a2b+ab2

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