方程题,0.05×x+0.04×(300-x)=13

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方程题,0.05×x+0.04×(300-x)=13方程题,0.05×x+0.04×(300-x)=13方程题,0.05×x+0.04×(300-x)=130.05*x-0.04*x+0.04*300

方程题,0.05×x+0.04×(300-x)=13
方程题,
0.05×x+0.04×(300-x)=13

方程题,0.05×x+0.04×(300-x)=13
0.05*x-0.04*x+0.04*300=13
0.01*x=1
x=100

5x+4(300-x)=1300
5x+1200-4x=1300
x=100

0.05x-0.04x+12=13
0.01x=1
x=100

100