问题 解答题
计算:
(1)(-1.2)×(-3);
(2)(-1
1
3
)×(-4
1
2
)

(3)15×(-
2
5
)

(4)(-1
7
8
)×0

(5)(-2.5)×2
1
3
答案

(1)(-1.2)×(-3)

=+(1.2×3)

=3.6;

(2)(-1

1
3
)×(-4
1
2

=(-

4
3
)×(-
9
2

=

4
3
×
9
2

=6;

(3)15×(-

2
5

=-15×

2
5

=-6;

(4)(-1

7
8
)×0=0;

(5)(-2.5)×2

1
3

=-

5
2
×
7
3

=-

35
6

单项选择题
单项选择题