Toán Lớp 6: Tìm số tự nhiên x,y sao cho:
a)(x+y).(x-y)=7 (x>y)
b)x²+y+x+xy=11
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Toán Lớp 6: Tìm số tự nhiên x,y sao cho:
a)(x+y).(x-y)=7 (x>y)
b)x²+y+x+xy=11
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