如题所述
23.4÷7.8-2.1
=3-2.1
=0.9
=3-2.1
=0.9
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第1个回答 2015-01-17
=3-2.1
=0.9追问
=0.9追问
0.75×18÷0.15
2.5×3.2×1.25
追答1、=13.5除以0.15
=90
2、=8乘1.25
=10
简便方法
追答第一个，先用0.75除以0.15再乘
2、=2.5乘以0.4+1.25乘以0.8
=1+1
=2
第2个回答 2015-01-17
=3-2.1=0.9
