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câu 1/ 5x(\(4x^2\)-2x+1) - 2x(\(10x^2\)-5x-2)
= 5x.\(4x^2\)-5x.2x+ 5x.1 - ( 2x.\(10x^2\)-2x.5x-2x.2)
= 9\(x^3\)-10\(x^2\)+5x - 20\(x^3\)+10\(x^2\)+4x
= (9\(x^3\)-\(20x^3\)) + (-10\(x^2\)+10\(x^2\)) + (5x+4x)
= \(-11x^3\) + 9x
à cj ơi, e 2k6, đọc phần lí thuyết r lm, nên có lỗi sai j mong cj thông cảm
A) x(5-2x)+2x(x-1)
= 5x - 2x2 + 2x2 - 2x
= 3x
B) (12x-5)(4x-1)+(3x-7)(1-16x)
= 48x - 12x - 20x + 5 + 3x - 48x - 7 + 112x
= 83x - 2
C) 2x(x-5)-x(2x+3)-5x(x+1)
= 2x2 - 10x - 2x2 - 3x - 5x2 - 5x
= -5x2 - 18x
Chúc bạn học tốt!!!
Thiếu đề là : Rút gọn biểu thức sau nhé !
a, \(x\left(5-2x\right)+2x\left(x-1\right)=5x-2x^2+2x^2-2x=3x\)
b, \(\left(12x-5\right)\left(4x-1\right)+\left(3x-7\right)\left(1-16x\right)\)
\(=48x^2-12x-20x+5+3x-48x^2-7+112x\)
\(=83x-2\)
c, \(2x\left(x-5\right)-x\left(2x+3\right)-5x\left(x+1\right)=2x^2-10x-2x^2-3x-5x^2-5x\)
\(=-5x^2-18x\)
\(a,\left(6x+1\right)\left(x+2\right)-2x\left(3x-5\right)\)
\(=6x^2+12x+x+2-6x^2+10x\)
\(=23x+2\)
a) (6x + 1)(x + 2) - 2x(3x - 5)
= 6x2 + 12x + x + 2 - 6x2 + 10x
= (6x2 - 6x2) + (12x + x + 10x) + 2
= 23x + 2
b) (2x - 1)2 - (2x - 3)(2x + 3)
= 4x2 - 4x + 1 - 4x2 + 9
= (4x2 - 4x2) - 4x + (1 + 9)
= -4x + 10
c) (2x - 3)3 - (3x + 1)(5 - 4x) - 16x2
= 8x3 - 36x2 + 54x - 15x + 12x2 - 5 + 4x - 16x2
= 8x3 - (36x2 - 12x2 + 16x2) + (54x - 15x + 4x) - 5
= 8x3 - 40x2 + 43x - 5
d) (3x + 2) - (x - 5) - x(3x - 13)
= 3x + 2 - x + 5 - 3x2 + 13x
= (3x - x + 13x) + (2 + 5) - 3x2
= 15x + 7 - 3x2
a) x(x-5)+2(x-5) = (x-5)(x+2)
b) (x-7)(x-2)
c) (x+2)(x^2+2x+4)+5y(x+2) = (x+2)(x^2+2x+4+5y)
d) (x^2+8)^2 -16x^2 = (x^2+8-4x)(x^2+8+4x)
\(2x\left(x-3\right)-x+3=0\)
<=> \(2x\left(x-3\right)-\left(x-3\right)=0\)
<=> \(\left(x-3\right)\left(2x-1\right)=0\)
<=> \(\orbr{\begin{cases}x=3\\x=\frac{1}{2}\end{cases}}\)
Vậy...
a: \(\left(2x-3\right)\left(3x^2+1\right)-6x\left(x^2-x+1\right)+3x^2-2x=10\)
\(\Leftrightarrow6x^3+2x-9x^2-3-6x^3+6x^2-6x+3x^2-2x=10\)
\(\Leftrightarrow-6x-3=10\)
=>-6x=13
hay x=-13/6
b: \(\Leftrightarrow3x^2-3x+x-2-3x^2+5x=-8-5x\)
=>3x-2=-5x-8
=>8x=-6
hay x=-3/4
c: \(\Leftrightarrow64x^3-27-64x^3+32x^2-32x^2+x=20\)
=>x-27=20
hay x=47
\(\dfrac{5x}{2x-3}-\dfrac{x-18}{3-2x}-\dfrac{16x}{2x-3}=\dfrac{5x+x-18-16x}{2x-3}=\dfrac{-10x-18}{2x-3}\)