问题描述:
54点9×0点三八简便运算
最佳答案:
解法一:
54.9×0.38
=(55-0.1)×0.38
=55×0.38-0.1×0.38
=20.9-0.038
=20.862
解法二:
54.9×0.38
= (55-0.1)(0.4-0.02)
=22-1.1-0.04+0.002
=20.862?
??问题描述:
54点9×0点三八简便运算
解法一:
54.9×0.38
=(55-0.1)×0.38
=55×0.38-0.1×0.38
=20.9-0.038
=20.862
解法二:
54.9×0.38
= (55-0.1)(0.4-0.02)
=22-1.1-0.04+0.002
=20.862?
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