Thu gọn các biểu thức: B= x(3x+2)^2-(x-1)(x^2+x+1)+2x(2x+1)(1-2x) 21/08/2021 Bởi Mary Thu gọn các biểu thức: B= x(3x+2)^2-(x-1)(x^2+x+1)+2x(2x+1)(1-2x)
`B= x(3x+2)^2-(x-1)(x^2+x+1)+2x(2x+1)(1-2x)` `=x(9x^2+12x+4)-x^3+1+2x(1-4x^2)` `=9x^3+12x^2+4x-x^3+1+2x-8x^3` `=(9x^3-x^3-8x^3)+12x^2+(4x+2x) +1` `=12x^2+6x+1` Bình luận
B = x(3x + 2)² – (x – 1)(x² + x + 1) + 2x(2x + 1)(1 – 2x) B = x (9x² + 12x + 4) – x³ + 1 + 2x(1 – 4x²) B = 9x³ + 12x² + 4x – x³ + 1 + 2x – 8x³ B = (9x³ – x³ – 8x³) + 12x² + (4x + 2x) + 1 B = 0 + 12x² + 6x + 1 Bình luận
`B= x(3x+2)^2-(x-1)(x^2+x+1)+2x(2x+1)(1-2x)`
`=x(9x^2+12x+4)-x^3+1+2x(1-4x^2)`
`=9x^3+12x^2+4x-x^3+1+2x-8x^3`
`=(9x^3-x^3-8x^3)+12x^2+(4x+2x) +1`
`=12x^2+6x+1`
B = x(3x + 2)² – (x – 1)(x² + x + 1) + 2x(2x + 1)(1 – 2x)
B = x (9x² + 12x + 4) – x³ + 1 + 2x(1 – 4x²)
B = 9x³ + 12x² + 4x – x³ + 1 + 2x – 8x³
B = (9x³ – x³ – 8x³) + 12x² + (4x + 2x) + 1
B = 0 + 12x² + 6x + 1