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42.5加24.4除以16和0.8乘以(13-2.52除以1.8)怎么用简便方法
人气:103 ℃ 时间:2019-10-09 09:27:47
解答
42.5+24.4÷16
=42.5+24.4÷4÷4
=42.5+6.1÷4
=42.5+1.525
=44.025

0.8×(13-2.52÷1.8)
=0.8×(13-2.52÷2÷0.9)
=0.8×(13-1.26×0.9)
=0.8×(13-1.4)
=0.8×11.6
=9.28
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