题目内容
脱式计算,注意使用简便方法
①12×
÷
②(2+
)×18
③
×
+
④77×
+23×0.8
⑤
÷[(
-
)×
].
①12×
| 3 |
| 8 |
| 3 |
| 4 |
②(2+
| 2 |
| 9 |
③
| 1 |
| 2 |
| 3 |
| 5 |
| 2 |
| 5 |
④77×
| 4 |
| 5 |
⑤
| 5 |
| 18 |
| 5 |
| 7 |
| 1 |
| 3 |
| 7 |
| 16 |
①12×
÷
=12×
×
,
=6;
②(2+
)×18
=2×18+
×18,
=36+4,
=40;
③
×
+
=
+
,
=
;
④77×
+23×0.8
=77×0.8+23×0.8,
=(77+23)×0.8,
=100×0.8,
=80;
⑤
÷[(
-
)×
]
=
÷[
×
],
=
×6,
=
.
| 3 |
| 8 |
| 3 |
| 4 |
=12×
| 4 |
| 3 |
| 3 |
| 8 |
=6;
②(2+
| 2 |
| 9 |
=2×18+
| 2 |
| 9 |
=36+4,
=40;
③
| 1 |
| 2 |
| 3 |
| 5 |
| 2 |
| 5 |
=
| 3 |
| 10 |
| 2 |
| 5 |
=
| 7 |
| 10 |
④77×
| 4 |
| 5 |
=77×0.8+23×0.8,
=(77+23)×0.8,
=100×0.8,
=80;
⑤
| 5 |
| 18 |
| 5 |
| 7 |
| 1 |
| 3 |
| 7 |
| 16 |
=
| 5 |
| 18 |
| 8 |
| 21 |
| 7 |
| 16 |
=
| 5 |
| 18 |
=
| 5 |
| 3 |
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