问题 解答题
计算:
(1)-23÷
4
9
×(-
2
3
2
(2)[1-(1-0.5×
1
3
)]×[2-(-3)2].
(3)-|-3+2
1
3
|-|-
1
3
|2+(-
1
3
2×(-1)9×(-2)3
(4)-22×(-3.14)-3.14×(-
1
2
)×(-6);
(5)(
7
4
-
7
8
-
7
12
)÷(-
7
8
)+(-
8
3
).
答案

(1)-23÷

4
9
×(-
2
3
2

=-8×

9
4
×
4
9

=-8;

(2)[1-(1-0.5×

1
3
)]×[2-(-3)2]

=[1-(1-

1
6
)]×[2-9]

=[1-

5
6
]×[-7]

=

1
6
×[-7]

=-

7
6

(3)-|-3+2

1
3
|-|-
1
3
|2+(-
1
3
2×(-1)9×(-2)3

=-

2
3
-
1
9
+
1
9
×(-1)×(-8)

=-

2
3
-
1
9
+
8
9

=

1
9

(4)-22×(-3.14)-3.14×(-

1
2
)×(-6)

=-4×(-3.14)-3.14×3

=(4-3)×3.14

=1×3.14

=3.14;

(5)(

7
4
-
7
8
-
7
12
)÷(-
7
8
)+(-
8
3

=(

7
4
-
7
8
-
7
12
)×(-
8
7
)+(-
8
3

=(-

7
4
×
8
7
+
7
8
×
8
7
+
7
12
×
8
7
)+(-
8
3

=-2+1+

2
3
-
8
3

=-3.

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