问题 解答题
耐心算一算
(1)(-3)+(-4)-(+11)-(-19);
(2)-3.5÷
7
8
×(-
8
7
)×|-
3
64
|;
(3)(
3
8
-
2
3
+
1
2
)×(-48);
(4)-12-(1-0.5)×
1
3
×[2-(-3)2].
答案

(1)原式=-3-4-11+19

=-18+19

=1;

(2)原式=

7
2
×
8
7
×
8
7
×
3
64

=

3
14

(3)原式=-

3
8
×48+
2
3
×48-
1
2
×48

=-18+32-24

=-42+32

=-10;

(4)原式=-1-

1
2
×
1
3
×[2-9].

=-1+-

1
2
×
1
3
×[-7].

=-1+

7
6

=

1
6

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