![](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)
\(\Leftrightarrow x^{2+4+6+...+98+100}=2^{2550}\)
\(\Leftrightarrow x^{2550}=2^{2550}\)
\(\Rightarrow\left[{}\begin{matrix}x=2\\x=-2\end{matrix}\right.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
1/ \(2.\left(-2\right)^3+5.\left(-6\right)-\left(-26\right)\)
\(=2.8+\left(-30\right)-\left(-26\right)\)
\(=16+\left(-30\right)-\left(-26\right)\)
\(=-14-\left(-26\right)\)
\(=12\)
2/ \(\left(-12\right)+\left(17-x\right)=6\)
\(17-x=6-\left(-12\right)\)
\(17-x=18\)
\(x=17-18=-1\)
3/ \(\left(x-1\right)^2=4\)
\(\Rightarrow\left(x-1\right)^2=2^2\)
\(\Rightarrow x-1=2\)
\(\Rightarrow x=3\)
Chúc bạn học tốt nha
2.(-2)^3+5.(-6)-(-26)=2.(-8)+5.(-6)-(-26)=(-16)+(-30)-(-26)=-20
-12+(17-x)=6
17-x=6-(-12)
17-x=18
x=17-18
x=-1
(x-1)^2=4
=>x-1=2
x=2+1
x=3
57.(43-14)-43.(57+14)=57.29-43.71=1653-3053=-1400
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{\text{( 100 + 72)}}{43x}=\frac{172}{43x}\Rightarrow172:2=86\)
=>\(86:43=2\)
vậy x=2
![](https://rs.olm.vn/images/avt/0.png?1311)
3\(^x\) . 3 = 43
=> 3\(^{\left(x+1\right)}\) = 43
=> Không có giá trị x thoả mãn .
49 . \(7^x\) = 2041
7\(^2\) . 7\(^x\) = 2041
7\(^{\left(x+2\right)}\) = 2041
=> \(7^{\left(x+2\right)}\) = 7\(^4\)
=> x + 2 = 4
=> x = 2
![](https://rs.olm.vn/images/avt/0.png?1311)
a)\(12\left(2x-6\right)-43=5^3\)
\(12\left(2x-6\right)=125+43\)
\(12\left(2x-6\right)=168\)
\(\left(2x-6\right)=168:12\)
\(\left(2x-6\right)=14\)
\(2x=14+6\)
\(2x=20\)
\(x=20:2\)
\(x=10.\)
b) \(7\left(25-3x\right)=3^4-2^5\)
\(7\left(25-3x\right)=49:7\)
\(7\left(25-3x\right)=7\)
\(\left(25-3x\right)=7:7\)
\(\left(25-3x\right)=1\)
\(3x=25-1\)
\(3x=24\)
\(x=24:3\)
\(x=8.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,A=4.3-1\\ =11\)
\(b,\) Từ 1 -> 2013 có số số hạng là:
\(\dfrac{2013-1}{1}+1=2013\) ( số hạng )
\(\implies\) \(B=\dfrac{\left(2013+1\right).2013}{2}=2027091\)
3(x-1)2=2 49
x-1 =2 49+6
x-1 =8 49
x =8 49-1
x =9 49