应用:
设原有梨子X箱.
X-40%X+150=X(1+20%)
(1-40%)X+150=1.2X
0.6X+150=1.2X
0.6X=150
X=250
·························
计算:63分之56 减去 63分之36 等于 63分之20
应用:
设原有梨子X箱.
X-40%X+150=X(1+20%)
(1-40%)X+150=1.2X
0.6X+150=1.2X
0.6X=150
X=250
·························
计算:63分之56 减去 63分之36 等于 63分之20