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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 9: giai he pt:3(x-7)=4(y-5) va 2x+y=5

Toán Lớp 9: giai he pt:3(x-7)=4(y-5) va 2x+y=5

Comments ( 1 )

  1. Ta có:{(3(x-7)=4(y-5)),(2x+y=5):}
    <=>{(3x-21=4y-20),(2x+y=5):}
    <=>{(3x-4y=-20+21),(2x+y=5):}
    <=>+{(3x-4y=1),(8x+4y=20):}
    <=>{(11x=21),(2x+y=5):}
    <=>{(x=21/11),(2.(21)/11+y=5):}
    <=>{(x=21/11),(y=13/11):}
    Vậy hệ phương trình có nghiệm là: (x;y)=(21/11;13/11)

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222-9+11+12:2*14+14 = ? ( )