mắc tham gia lp =))

cho đa thức A=2x(x+3)-(x+2)(2x-3)+x-2

a) rút gọn A

b) tính giá trị của A khi (x+1)=2

c) tìm x để A cs giá trị =\(\dfrac{1}{2}\)

HSG ; 15/20 đ :)))

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