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nam839317
2 năm trước
chứng minh biểu thức sau không phụ thuộc vào biến x,y A=(3x-5)(2x+11)-(2x+3)(3x+7) B=(2x+3)(4x^2-6x+9)-2(4x^3-1) C=(x-1)^3-(x+1)^3+6(x+1)(x-1) ai giúp e với ạ e xin cám ơn
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