试题:
脱式计算
①2700×(506-499)÷900
②[1
1
8
+(0.65+
7
20
1
7
]×4.8.

答案:

我来补答
①2700×(506-499)÷900
=2700÷900×7,
=3×7,
=21;

②[1
1
8
+(0.65+
7
20
1
7
]×4.8,
=[1
1
8
+1÷
1
7
]×4.8,
=(1
1
8
+7)×4.8,
=
65
8
×4.8,
=39.
 
 
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