2(x-150)=5(3y+50) 10%x+6%y=17%乘以400
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![2(x-150)=5(3y+50) 10%x+6%y=17%乘以400](/uploads/image/z/1641172-4-2.jpg?t=2%EF%BC%88x-150%EF%BC%89%3D5%EF%BC%883y%2B50%EF%BC%89+10%25x%2B6%25y%3D17%25%E4%B9%98%E4%BB%A5400)
2(x-150)=5(3y+50) 10%x+6%y=17%乘以400
2(x-150)=5(3y+50) 10%x+6%y=17%乘以400
2(x-150)=5(3y+50) 10%x+6%y=17%乘以400
2(x-150)=5(3y+50)
10%x+6%y=17%*400
整理,得:
2x-15y=550①
5x+3y=3400②
②×5,得:
25x+125y=17000③
①+③,得:
27x=17550
x=650
代入①,得:
2×650-15y=550
15y=750
y=50
x=650 y=50