问题 解答题
计算:
(1)0.125×(-7)×8;
(2)-
1
12
十(0.3×3
1
3
+
1
3
)÷|-
1
4
|;
(3)-9
22
23
×(-69);
(4)(-1
1
2
-
3
8
+
7
12
)÷(-
1
24
);
(5)[2
1
2
-(
7
9
-
11
12
+
1
6
)×36]÷5;
(6)(-370)×(-
1
4
)+0.25×24.5+(-5
1
2
)×(-25%).
答案

(1)原式=(0.125×8)×(-7)

=1×(-7)

=-7;

(2)原式=-

1
12
+(
3
10
×
10
3
+
1
3
)÷
1
4

=-

1
12
+
4
3
×4

=-

1
12
+
16
3

=

21
4

(3)原式=(-10+

1
23
)×(-69)

=(-10)×(-69)+

1
23
×(-69)

=690-3

=687;

(4)原式=(-1

1
2
)×(-24)-
3
8
×(-24)+
7
12
×(-24)

=36+9-14

=31;

(5)原式=[

5
2
-(
7
9
×36-
11
12
×36+
1
6
×36)]÷5

=[

5
2
-(28-33+6)]÷5

=[

5
2
-1]÷5

=

3
2
×
1
5

=

3
10

(6)原式=370×

1
4
+
1
4
×24.5+
11
2
×
1
4

=

1
4
×(370+24.5+
11
2

=

1
4
×400

=100.

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