Toán Lớp 6: 3y-xy-2x=-13 5x-xy-2y=-10 -xy+2x-3y=-18 4y-xy-2x=-1 x ²-xy+8x-8y=3 x ²+x+y+xy=5 -

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Toán Lớp 6: 3y-xy-2x=-13 5x-xy-2y=-10 -xy+2x-3y=-18 4y-xy-2x=-1 x ²-xy+8x-8y=3 x ²+x+y+xy=5