(1+40%)乘以X乘以80%—X=15
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(1+40%)乘以X乘以80%—X=15(1+40%)乘以X乘以80%—X=15(1+40%)乘以X乘以80%—X=15由题意得1.4x×0.8-x=151.12x-x=150.12x=153/25x
(1+40%)乘以X乘以80%—X=15
(1+40%)乘以X乘以80%—X=15
(1+40%)乘以X乘以80%—X=15
由题意得1.4x×0.8-x=15
1.12x-x=15
0.12x=15
3/25x=15
x=15×25/3
x=125
x=125
(1+40%)乘以X乘以80%—X=15
(1+40%)乘以X乘以80%—X=15 (1+40%)乘以X乘以80%—X=15
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