解方程组x+y=300,0.05x+0.53y=0.25x*300请速解

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解方程组x+y=300,0.05x+0.53y=0.25x*300请速解解方程组x+y=300,0.05x+0.53y=0.25x*300请速解 解方程组x+y=300,0.05x+0.53

解方程组x+y=300,0.05x+0.53y=0.25x*300请速解
解方程组x+y=300,0.05x+0.53y=0.25x*300
请速解


 

解方程组x+y=300,0.05x+0.53y=0.25x*300请速解
x+y=300,(1)
0.05x+0.53y=0.25x*300
5x+53y=25*300 (2)
(2)-(1)*5
48y=20*300
y=125
x=175

x+y=300,(1)
0.05x+0.53y=0.25x*300
5x+53y=25*300 (2)
(2)-(1)*5
48y=20*300
y=125
x=175