Toán Lớp 8: (a-2b)^2-4b^2
25(x-3)^2-(2x-7)^2
9(a+b)^2-4(a-2b)^2
49(x-5)^2-25(2x-1)^2
81(x+7)^2-(3x+8)^2
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Toán Lớp 8: (a-2b)^2-4b^2
25(x-3)^2-(2x-7)^2
9(a+b)^2-4(a-2b)^2
49(x-5)^2-25(2x-1)^2
81(x+7)^2-(3x+8)^2
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