式4a+3ab−1/2b减去−2a−3/2ab+1/3b的差是_.

问题描述:

4a+3ab−

1
2
b减去−2a−
3
2
ab+
1
3
b
的差是______.

(4a+3ab-

1
2
b)-(-2a-
3
2
ab+
1
3
b)
=4a+3ab-
1
2
b+2a+
3
2
ab-
1
3
b
=6a+
9
2
ab-
5
6
b.
故答案为:6a+
9
2
ab-
5
6
b.