四年级35×68+68+68×64和800÷25用简便算法怎么算?
人气:295 ℃ 时间:2019-11-17 21:51:02
解答
35x68+68x68x64
=68x(35+1+64)
=68x100
=6800
800÷25
=8x100÷25
=8x4
=32
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