13.69*0.4-0.969*4怎么简便算

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13.69*0.4-0.969*4怎么简便算
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13.69*0.4-0.969*4怎么简便算
13.69*0.4-0.969*4怎么简便算

13.69*0.4-0.969*4怎么简便算
13.69*0.4-0.969*4
= 13.69*0.4-9.69*0.4
=0.4*(13.69-9.69)
=0.4*4
=1.6

原式=13.69*0.4-9.69*0.4
=(13.69-9.69)*0.4
=(14-(0.31+9.69))*0.4
=(14-10)*0.4
=4*0.4=1.6

提取0.4 原式= 0.4*(13.69-9.69)=0.4*4=1.6