题目内容
计算:
(1)(
-
+
)×(-12)÷(-6)
(2)-14-[1-(1-0.5×
)]×[2-(-3)2]
(3)-22-(-3)3×(-1)4-(-1)5
(4)(-
)×(-34)-
×17-
×(-6).
(1)(
| 7 |
| 12 |
| 5 |
| 6 |
| 3 |
| 4 |
(2)-14-[1-(1-0.5×
| 1 |
| 3 |
(3)-22-(-3)3×(-1)4-(-1)5
(4)(-
| 5 |
| 23 |
| 5 |
| 23 |
| 5 |
| 23 |
(1)(
-
+
)×(-12)÷(-6)
=(
-
+
)×(-12)×(-
)
=(
-
+
)×2
=2×
-2×
+2×
=
-
+
=1;
(2)-14-[1-(1-0.5×
)]×[2-(-3)2]
=-1-(1-1+0.5×
)×(2-9)
=-1-
×(-7)
=-1+
=
;
(3)-22-(-3)3×(-1)4-(-1)5
=-4-(-27)×1-(-1)
=-4+27+1
=24;
(4)(-
)×(-34)-
×17-
×(-6)
=
×(34-17+6)
=
×23
=5.
| 7 |
| 12 |
| 5 |
| 6 |
| 3 |
| 4 |
=(
| 7 |
| 12 |
| 5 |
| 6 |
| 3 |
| 4 |
| 1 |
| 6 |
=(
| 7 |
| 12 |
| 5 |
| 6 |
| 3 |
| 4 |
=2×
| 7 |
| 12 |
| 5 |
| 6 |
| 3 |
| 4 |
=
| 7 |
| 6 |
| 5 |
| 3 |
| 3 |
| 2 |
=1;
(2)-14-[1-(1-0.5×
| 1 |
| 3 |
=-1-(1-1+0.5×
| 1 |
| 3 |
=-1-
| 1 |
| 6 |
=-1+
| 7 |
| 6 |
=
| 1 |
| 6 |
(3)-22-(-3)3×(-1)4-(-1)5
=-4-(-27)×1-(-1)
=-4+27+1
=24;
(4)(-
| 5 |
| 23 |
| 5 |
| 23 |
| 5 |
| 23 |
=
| 5 |
| 23 |
=
| 5 |
| 23 |
=5.
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