Rút gọn -3x?x+2)^2+(x+3)(x-1)(x+1)-(2x-3)^2 03/07/2021 Bởi Parker Rút gọn -3x?x+2)^2+(x+3)(x-1)(x+1)-(2x-3)^2
Sửa đề: `-3x(x + 2)² + (x + 3)(x – 1)(x + 1) – (2x – 3)²` `= -3x(x² + 4x + 4) + (x + 3)(x² – 1) – (4x² – 12x + 9)` `= -3x³ – 12x² – 12x + x³ – x + 3x² – 3 – 4x² + 12x – 9` `= -2x³ – 13x² – x – 12 ` Bình luận
Đáp án+giải thích các bước giải: -3x(x + 2) ² + (x + 3)(x – 1)(x + 1) – (2x – 3) ² = -3x(x² + 4x + 4) + (x + 3)(x² – 1) – (4x² – 12x + 9) = -3x³ – 12x² – 12x + x³ – x + 3x² – 3 – 4x² + 12x – 9 = -2x³ – 13x² – x – 12 Bình luận
Sửa đề:
`-3x(x + 2)² + (x + 3)(x – 1)(x + 1) – (2x – 3)²`
`= -3x(x² + 4x + 4) + (x + 3)(x² – 1) – (4x² – 12x + 9)`
`= -3x³ – 12x² – 12x + x³ – x + 3x² – 3 – 4x² + 12x – 9`
`= -2x³ – 13x² – x – 12 `
Đáp án+giải thích các bước giải:
-3x(x + 2) ² + (x + 3)(x – 1)(x + 1) – (2x – 3) ²
= -3x(x² + 4x + 4) + (x + 3)(x² – 1) – (4x² – 12x + 9)
= -3x³ – 12x² – 12x + x³ – x + 3x² – 3 – 4x² + 12x – 9
= -2x³ – 13x² – x – 12