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Toán Lớp 7: 1. x/2=y/3;y/5=z/4; x-y +z=-49 2.6x=4y=5z; 3x+y-2z=42

Home/ Toán Lớp 7: 1. x/2=y/3;y/5=z/4; x-y +z=-49 2.6x=4y=5z; 3x+y-2z=42

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