题目内容

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
(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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