![](https://rs.olm.vn/images/avt/0.png?1311)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
- \(15+4x< 2x-145\)
\(\Rightarrow15+4x-2x+145< 0\)
\(\Rightarrow\left(15+145\right)+\left(4x-2x\right)< 0\)
\(\Rightarrow160+2x< 0\)
\(\Rightarrow2x< 0-160\)
\(\Rightarrow2x< -160\)
\(\Rightarrow x< \left(-160\right)\div2\)
\(\Rightarrow x< -80\)
Vậy x < -80
- \(-3\left(2x+5\right)-16< -4\left(3-2x\right)\)
\(\Rightarrow\left(-3\right)\times2x+\left(-3\right)\times5-16< \left(-4\right)\times3-\left(-4\right)\times2x\)
\(\Rightarrow-6x+\left(-15\right)-16< \left(-12\right)-\left(-8x\right)\)
\(\Rightarrow-6x-15-16< \left(-12\right)+8x\)
\(\Rightarrow-6x-31< \left(-12\right)+8x\)
\(\Rightarrow-6x-31+12-8x< 0\)
\(\Rightarrow-6x-8x-31+12< 0\)
\(\Rightarrow\left(-6x-8x\right)-19< 0\)
\(\Rightarrow-14x-19< 0\)
\(\Rightarrow-14x< 0+19\)
\(\Rightarrow-14x< 19\)
\(\Rightarrow x< 19\div\left(-14\right)\)
\(\Rightarrow x< -\frac{19}{14}\)
Vậy \(x< -\frac{19}{14}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\text{a) 2x - (-1) = 1 }\)
\(2x=1-1\)
\(2x=0\)
\(\Rightarrow x=0\)
\(\text{b) 484 + x = -363 - (-548)}\)
\(484+x=185\)
\(x=185-484\)
\(x=-299\)
\(\text{c) 7x - 8 = 713}\)
\(7x=713+8\)
\(7x=721\)
\(x=721:7\)
\(x=13\)
chúc bạn học tốt !!!
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(x+3\right)+\left(x+5\right)+\left(x+7\right)+.....+\left(x+49\right)=713.\)
\(\Rightarrow\left\{\left[\left(x+49\right)-\left(x+3\right)\right]:2+1\right\}.\left[\left(x+49\right)+x+3\right]:2=713\)
\(\Rightarrow24.\left(x+49+x+3\right)=713.2\)
\(\Rightarrow24.\left(2x+52\right)=1426\)
\(\Rightarrow2x+52=1426:24\)
\(\Rightarrow2x+52\approx59,42\)
\(\Rightarrow2x\approx59,42-52=7,42\)
\(\Rightarrow x\approx3,71\)
Chú ý : Dấu xấp sỉ \(\approx\)
Ta có :
(x+3)+(x+5)+(x+7)+.....+(x+49)=713
24.x+(3+5+7+...+49)=713
24.x+624=713
24.x=89
x=89/24
![](https://rs.olm.vn/images/avt/0.png?1311)
a, (x-35)-120=0
x-35=120+0
x-35=120
x=120+35
x=155
b,7x-8=713
7x=713+8
7x=721
x=721:7
x=103
c,4x:17=0
4x=0.17
4x=0
x=0:4
x=0
d,75+(131-x)=205
131-x=205-75
131-x=130
x=131-130
x=1
e,2x-36=4^6:4^3
2x-36=4^6-3
2x-36=4^3
2x-36=48
2x=48-36
2x=12
x=12:2
x=6
f, 2011^2.2011^x=2011^6
2011^x=2011^6: 2011^2
2011^x=2011^6-2
2011^x=2011^4
x=4
bn
\(\text{a/ ( x-35 ) - 120 = 0}\)
\(\Rightarrow\left(x-35\right)=120\)
\(\Rightarrow x=120+35\)
\(x=155\)
\(\text{b/ 7x - 8 = 713}\)
\(\Rightarrow7x=713+8=721\)
\(x=721:7=103\)
\(\text{c/ 4x : 17 = 0}\)
\(4x=0\)
\(x=0\)
\(\text{d/ 75+(131-x) = 205}\)
\(131-x=205-75=130\)
\(x=131-130=1\)
\(e.2x-36=4^6:4^3\)
\(2x-36=4^3=64\)
\(2x=64+36=100\)
\(x=100:2=50\)
\(f.2011^2.2011^x=2011^6\)
\(\text{Ta có công thức }:x^n.x^m=x^{n+m}\)
\(\Rightarrow x=6-2=4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
7x-8=713.
7x=713+8.
7x=721.
x=721:7.
x=103.
Vậy x=103.
P/S:Bạn Loli Con lại ảo tưởng rồi,ai đúng bn cũng tk đc à!
![](https://rs.olm.vn/images/avt/0.png?1311)
`(713-2x):3=145`
`713-2x=145xx3`
`713-2x=435`
`2x=713-435`
`2x=278`
`x=278:2`
`x=139`
\(\left(713-2x\right):3=145\)
\(713-2x=145\times3\)
\(713-2x=435\)
\(2x=713-435\)
2x=278
x=278:2
x=139