题目内容

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)
(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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