
脱式计算,注意使用简便方法①12×38÷34②(2+29)×18③12×35+25④77×45+23×0.8⑤518÷[(57?13)×
脱式计算,注意使用简便方法①12×38÷34②(2+29)×18③12×35+25④77×45+23×0.8⑤518÷[(57?13)×716]....
脱式计算,注意使用简便方法①12×38÷34②(2+29)×18③12×35+25④77×45+23×0.8⑤518÷[(57?13)×716].
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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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