Toán Lớp 7: Rút gọn: `a, (2x-3)^2-(3x-1)^2-2(x+1)(x-1)` `b, (a+b+c)^2+(a+b-c)^2-2(a+b)^2` -

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Toán Lớp 7: Rút gọn: `a, (2x-3)^2-(3x-1)^2-2(x+1)(x-1)` `b, (a+b+c)^2+(a+b-c)^2-2(a+b)^2`