86*13.7-18.6*0.37

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86*13.7-18.6*0.3786*13.7-18.6*0.3786*13.7-18.6*0.371.86*13.7-18.6*0.37=1.86*13.7-1.86*3.7=1.86*(13.7

86*13.7-18.6*0.37
86*13.7-18.6*0.37

86*13.7-18.6*0.37
1.86*13.7-18.6*0.37
=1.86*13.7-1.86*3.7
=1.86*(13.7-3.7)
=1.86*10
=18.6

你好,冬瓜皮111
1.86×13.7-18.6×0.37
=1.86×13.7-1.86×3.7
=1.86×(13.7-3.7)(乘法分配律)
=1.86×10
=18.6

=18.6*1.37-18.6*0.37
=18.6*(1.37-0.37)
=18.6*1
=18.6

1.86*13.7-18.6*0.37
=1.86*(13.7-3.7)
=1.86*10
=18.6