x+20*40%=80急

网友回答

x+20*40%=80
x=80-20*40%
x=80-20*0.4
x=80-8
x=72======以下答案可供参考======
供参考答案1:
x+20*0.4=80
x+8=80
x=80-8
x=76检验76+20*0.4
=76+8=80