Toán Rút gọn biểu thức sau: (4-3x)(2x-1)-2(3x-1)(1-2x)+(3x+1)(4-5x) 10/09/2021 By Anna Rút gọn biểu thức sau: (4-3x)(2x-1)-2(3x-1)(1-2x)+(3x+1)(4-5x)
$(-3x+4)(2x-1)+2(3x-1)(2x-1)+(3x+1)(-5x+4)$ $= (2x-1)[-3x+4+2(3x-1)]+(3x+1)(-5x+4)$ $= (2x-1)(3x+2)+(3x+1)(-5x+4)$ $= 6x^2+x-2-15x^2+7x+4$ $= -9x^2+8x+2$ Trả lời
(4-3x)(2x-1)-2(3x-1)(1-2x)+(3x+1)(4-5x)
= 8x-4-6x²+3x+10x-12x²-2-8x+4
= -18x²+13x-2
$(-3x+4)(2x-1)+2(3x-1)(2x-1)+(3x+1)(-5x+4)$
$= (2x-1)[-3x+4+2(3x-1)]+(3x+1)(-5x+4)$
$= (2x-1)(3x+2)+(3x+1)(-5x+4)$
$= 6x^2+x-2-15x^2+7x+4$
$= -9x^2+8x+2$