a) (3x - 5)3 - 1 = 26
b) 2x+2 - 2x = 48
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(a,\Rightarrow 2x^2-10x-3x-2x^2=26\\ \Rightarrow -13x=26\\ \Rightarrow x=-2\\ b, \Rightarrow -2x^2+3x+3-3x-3+2x^2-x=18\\ \Rightarrow -x=18\Rightarrow x=-18\)
a, 36:(x–5) = 2 2
(x–5) = 9
x = 14
b, [3.(70–x)+5]:2 = 46
[3.(70–x)+5] = 92
70–x = 29
x = 41
c, 450:[41–(2x–5)] = 3 2 .5
41–(2x–5) = 10
2x–5 = 31
2x = 36
x = 18
d, 230+[ 2 4 +(x–5)] = 315. 2018 0
16+(x–5) = 315–230
x–5 = 85–16
x = 69+5
x = 74
e, 2 x + 2 x + 1 = 48
2 x .(2+1) = 48
2 x = 16 = 2 4
x = 4
f, 3 x + 2 + 3 x = 2430
3 x . 3 2 + 1 = 2430
3 x = 2430:10 = 243 = 3 5
x = 5
`a)(x-2)(x^2+2x+4)-x(x-3)(x+3)=26`
`<=>x^3-2^3-x(x^2-9)=26`
`<=>x^3-8-x^3+9x=26`
`<=>9x-8=26`
`<=>9x=34`
`<=>x=34/9`
`b)(x-3)(x^2+3x+9)-x(x+4)(x-4)=21`
`<=>x^3-3^3-x(x^2-16)=21`
`<=>x^3-27-x^3+16x=21`
`<=>16x-27=21`
`<=>16x=48`
`<=>x=3`
a) 6.(x + 11) - 7.(2 - x) = 26
6x + 66 - 14 + 7x = 26
13x + 52 = 26
13x = 26 - 52
13x = -26
x = -26 : 13
x = -2
b) 2.(x - 1) - 3.(2x + 2) - 4.(2x + 3) = -2016
2x - 2 - 6x - 6 - 8x - 12 = -2016
-12x - 20 = -2016
-12x = -2016 + 20
-12x = -1996
x = (-1996) : (-12)
x = 49/3
a) \(9x^2-1=\left(3x+1\right)\left(4x+1\right)\)
\(\Leftrightarrow\)\(\left(3x-1\right)\left(3x+1\right)-\left(3x+1\right)\left(4x+1\right)=0\)
\(\Leftrightarrow\)\(\left(3x+1\right)\left(3x-1-4x-1\right)=0\)
\(\Leftrightarrow\)\(\left(3x+1\right)\left(-x-2\right)=0\)
\(\Leftrightarrow\)\(\orbr{\begin{cases}3x+1=0\\-x-2=0\end{cases}}\)
\(\Leftrightarrow\)\(\orbr{\begin{cases}x=-\frac{1}{3}\\x=-2\end{cases}}\)
Vậy...
\(a,-5.\left(-x+7\right)-3.\left(-x-5\right)=-4.\left(12-x\right)+48\)
\(5x-35-3x+15=-48+4x+48\)
\(2x-10=4x\)
\(2x-4x=10\)
\(-2x=10\)
\(x=-5\)
\(b,\left(-x-7\right)-5.\left(-x-3\right)=12.\left(3-x\right)\)
\(-x-7+5x+15=36-12x\)
\(4x+8=36-12x\)
\(4x+12x=36-8\)
\(16x=28\)
\(x=1,75\)
các câu còn lại tương tự nha
a)3(x-1)(2x-1)-5(x+8)(x-1)=0
<=>(x-1)(6x-3-5x-40)=0
<=>(x-1)(x-43)=0
b)2x^3+3x^2-32x-48=0
<=>x^2(2x+3)-16(2x+3)=0
<=>(2x+3)(x-4)(x+4)=0
học tốt