(x-15)×10+(x-12.5)×40=(15×10+12.5×40)×12%
当x=14时
左边=(x-15)×10+(x-12.5)×40
=-10+60
=50
右边=(15×10+12.5×40)×12%
=650×12%
=78
左边≠右边
x=14不能使等式成立
(x-15)×10+(x-12.5)×40=(15×10+12.5×40)×12%
当x=14时
左边=(x-15)×10+(x-12.5)×40
=-10+60
=50
右边=(15×10+12.5×40)×12%
=650×12%
=78
左边≠右边
x=14不能使等式成立