问题
解答题
脱式计算 ①2700×(506-499)÷900 ②[1
|
答案
①2700×(506-499)÷900
=2700÷900×7,
=3×7,
=21;
②[1
+(0.65+1 8
)÷7 20
]×4.8,1 7
=[1
+1÷1 8
]×4.8,1 7
=(1
+7)×4.8,1 8
=
×4.8,65 8
=39.
脱式计算 ①2700×(506-499)÷900 ②[1
|
①2700×(506-499)÷900
=2700÷900×7,
=3×7,
=21;
②[1
+(0.65+1 8
)÷7 20
]×4.8,1 7
=[1
+1÷1 8
]×4.8,1 7
=(1
+7)×4.8,1 8
=
×4.8,65 8
=39.