138*1.25+23.3*(2-0.75)-1.25*38+(1+0.25)*28.7 写出计算过程,用简便方法
138*1.25+23.3*(2-0.75)-1.25*38+(1+0.25)*28.7写出计算过程,用简便方法...
138*1.25+23.3*(2-0.75)-1.25*38+(1+0.25)*28.7 写出计算过程,用简便方法
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2013-07-24
展开全部
138*1.25+23.3*(2-0.75)-1.25*38+(1+0.25)*28.7
=138*1.25+23.3*1.25-1.25*38+1.25*28.7
=1.25*(138+23.3-38+28.7)
=1.25*(100+52)
=1.25*(150+2)=187.5+2.5=190
=138*1.25+23.3*1.25-1.25*38+1.25*28.7
=1.25*(138+23.3-38+28.7)
=1.25*(100+52)
=1.25*(150+2)=187.5+2.5=190
2013-07-24
展开全部
138*1.25+23.3*(2-0.75)-1.25*38+(1+0.25)*28.7
=138*1.25+23.3*1.25-1.25*38+(1+0.25)*28.7
=1.25*(138+23.3-38+28.7)
=1.25*152
=(1+0.25)*152
=152+0.25*152
=152+38
=190
=138*1.25+23.3*1.25-1.25*38+(1+0.25)*28.7
=1.25*(138+23.3-38+28.7)
=1.25*152
=(1+0.25)*152
=152+0.25*152
=152+38
=190
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2013-07-24
展开全部
1.25(1.38+23.3+28.7-38)=17.975
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