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

Toán Lớp 9: tìm nghiệm nguyên của pt:x²-y²+2x+4y-8=0

Toán Lớp 9: tìm nghiệm nguyên của pt:x²-y²+2x+4y-8=0

Comments ( 2 )

  1. Bạn kham khảo
    x^2-y^2+2x+4y-8=0
    <=>x^2+2x+1-(y^2-4y+4)-5=0
    <=>(x+1)^2-(y-2)^2=5
    <=>(x+y-1)(x-y+3)=0
    <=>[({(x+y-1=1),(x-y+3=5):}),({(x+y-1=5),(x-y+3=1):}),({(x+y-1=-1),(x-y+3=-5):}),({(x+y-1=-5),(x-y+3=-1):}):}
    <=>[({(x=2),(y=0):}),({(x=2),(y=4):}),({(x=-4),(y=4):}),({(x=-4),(y=0):}):}

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