X*10%+(100-X)*0.9%=100*4%如何算

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X*10%+(100-X)*0.9%=100*4%如何算X*10%+(100-X)*0.9%=100*4%如何算X*10%+(100-X)*0.9%=100*4%如何算X10%+(100-X)0.9%

X*10%+(100-X)*0.9%=100*4%如何算
X*10%+(100-X)*0.9%=100*4%如何算

X*10%+(100-X)*0.9%=100*4%如何算
X10%+(100-X)0.9%=100*4%
X10+(100-X)0.9=100*4
X9.1+90=400
X9.1=310
X=3100/91