问题 解答题
计算:
(1)(
7
12
-
5
6
+
3
4
)×(-12)÷(-6)
(2)-14-[1-(1-0.5×
1
3
)]×[2-(-3)2]

(3)-22-(-3)3×(-1)4-(-1)5
(4)(-
5
23
)×(-34)-
5
23
×17-
5
23
×(-6)
答案

(1)(

7
12
-
5
6
+
3
4
)×(-12)÷(-6)

=(

7
12
-
5
6
+
3
4
)×(-12)×(-
1
6

=(

7
12
-
5
6
+
3
4
)×2

=2×

7
12
-2×
5
6
+2×
3
4

=

7
6
-
5
3
+
3
2

=1;

(2)-14-[1-(1-0.5×

1
3
)]×[2-(-3)2]

=-1-(1-1+0.5×

1
3
)×(2-9)

=-1-

1
6
×(-7)

=-1+

7
6

=

1
6

(3)-22-(-3)3×(-1)4-(-1)5

=-4-(-27)×1-(-1)

=-4+27+1

=24;

(4)(-

5
23
)×(-34)-
5
23
×17-
5
23
×(-6)

=

5
23
×(34-17+6)

=

5
23
×23

=5.

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