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Thunhi111
2 năm trước
Bài 4: Rút gọn rồi tính giá trị biểu thức: a/ A=5x(4x2-2x+1) – 2x(10x2 -5x -2) với x= 15. b/ B = 5x(x-4y) -4y(y -5x) với x= ; y= c/ C = 6xy(xy –y2) -8x2(x-y2) - 5y2(x2-xy) với x= ; y= 2. d/ D = (y2 +2)(y- 4) – (2y2+1)( y – 2) với y=- Bài 5: Cho các đa thức: f(x) = 3x2 – x + 1 và g(x) = x – 1 a)Tính f(x).g(x) b)Tìm x để f(x).g(x) + x2[1 – 3.g(x)] =
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