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17.2÷2+2.8×0.5  1.72÷4+2.28×0.25 怎样简便计算
人气:158 ℃ 时间:2020-01-29 01:56:10
解答
17.2÷2+2.8×0.5
=17.2×0.5+2.8×0.5
=(17.2+2.8)×0.5
=20×0.5
=10
1.72÷4+2.28×0.25
=1.72×0.25+2.28×0.25
=(1.72+2.28)×0.25
=4×0.25
=1
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