Toán Lớp 8: Câu 1:( 2x-1)^2- (x+3)^2
Câu 2: x^2+2x+1-y^2
Câu 3: 6x^2+3xy-3y^2
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Toán Lớp 8: Câu 1:( 2x-1)^2- (x+3)^2
Câu 2: x^2+2x+1-y^2
Câu 3: 6x^2+3xy-3y^2
Giúp nha m.n ơi
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