4.86乘以 9.9的简便计算 4.9乘以1.02的简便计算 3.84乘以9.6+0.96乘以61.6
题目
4.86乘以 9.9的简便计算 4.9乘以1.02的简便计算 3.84乘以9.6+0.96乘以61.6
答案
4.86× 9.9
=4.86×10-4.86×0.1
=48.6-0.486
=48.114
4.9×1.02
=5×1.02-0.1×1.02
=5.1-0.102
=4.998
3.84乘以9.6+0.96乘以61.6
=3.84×9.6+9.6×6.16
=9.6×(3.84+6.16)
=9.6×10
=96
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