问题 解答题
计算:(1)3(2m-
1
3
);
(2)-7y+(2y-3)-2(3y+2).
答案

(1)3(2m-

1
3

=3×2m-3×

1
3

=6m-1.

(2)-7y+(2y-3)-2(3y+2)

=-7y+2y-3-2×3y+(-2)×2

=-7y+2y-3-6y-4

=(-7+2-6)y-7

=-11y-7.

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