题目内容
计算下列各题
(1)-23÷(-
)2+9×(-
)3-(-1)100;
(2)199
×(-5)
(3)[3
÷(-
)×
]4-2×(-3)3-(-5)2
(4)-0.52+(-
)2-|-22-4|-(-1
)3×(
)3÷(-
)4.
(1)-23÷(-
| 1 |
| 2 |
| 1 |
| 3 |
(2)199
| 198 |
| 199 |
(3)[3
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 5 |
(4)-0.52+(-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
(1)-23÷(-
)2+9×(-
)3-(-1)100
=-8÷
+9×(-
)-1
=-8×4+(-
)-1
=(-32)+(-1)+(-
)
=-33
;
(2)199
×(-5)
=(200-
)×(-5)
=200×(-5)+(-
)×(-5)
=-1000+
=-(1000-
)
=-999
;
(3)[3
÷(-
)×
]4-2×(-3)3-(-5)2
=[
×(-
)×
]4-2×(-27)-25
=(-1)4+54-25
=1+54-25
=55-25
=30;
(4)-0.52+(-
)2-|-22-4|-(-1
)3×(
)3÷(-
)4
=-0.25+
-|-4-4|-
×
÷
,
=-0.25+0.25-8-
×16,
=-8-2
=(-8)+(-2)
=-10.
| 1 |
| 2 |
| 1 |
| 3 |
=-8÷
| 1 |
| 4 |
| 1 |
| 27 |
=-8×4+(-
| 1 |
| 3 |
=(-32)+(-1)+(-
| 1 |
| 3 |
=-33
| 1 |
| 3 |
(2)199
| 198 |
| 199 |
=(200-
| 1 |
| 199 |
=200×(-5)+(-
| 1 |
| 199 |
=-1000+
| 5 |
| 199 |
=-(1000-
| 5 |
| 199 |
=-999
| 194 |
| 199 |
(3)[3
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 5 |
=[
| 10 |
| 3 |
| 3 |
| 2 |
| 1 |
| 5 |
=(-1)4+54-25
=1+54-25
=55-25
=30;
(4)-0.52+(-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
=-0.25+
| 1 |
| 4 |
| 27 |
| 8 |
| 1 |
| 27 |
| 1 |
| 16 |
=-0.25+0.25-8-
| 1 |
| 8 |
=-8-2
=(-8)+(-2)
=-10.
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