问题 解答题
细心算一算.
(1)|-2.7|+(-3.5);
(2)
1
9
×(-7.2)÷(-2
2
5
)

(3)(
2
3
)2×(-1.5) -
2
3
÷(-1.52)

(4)-59
15
16
×32
答案

(1)|-2.7|+(-3.5)

=2.7-3.5

=-(3.5-2.7)

=-0.8;

(2)

1
9
×(-7.2)÷(-2
2
5
)

=(-

4
5
)×(-
5
12

=

1
3

(3)原式=

4
9
×(-
3
2
)-
2
3
×(-
4
9

=-

2
3
+
8
27

=-(

2
3
-
8
27

=-

10
27

(4)-59

15
16
×32

=(

1
16
-60)×32

=

1
16
×32-60×32

=2-1920

=-

=-1918.

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