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Mathematics, 04.09.2021 14:00 juliana0122

Rút gọn rồi tính giá trị của biểu thức sau: a) B= (x+y-7)^-2(x+y-7)(y-6)+(y-6)^2 tại x=101
b) C=(x-2y)(x^2+2xy+4y^2)-6xy(x-2y) tại x=3; y=1/2

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Rút gọn rồi tính giá trị của biểu thức sau: a) B= (x+y-7)^-2(x+y-7)(y-6)+(y-6)^2 tại x=101
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