(x+1/4)2=1/64
giup mik vs
giai giup mik cau nay di (x+1/4)=1/64
\(x+\frac{1}{4}=\frac{1}{64}\)
\(x=\frac{1}{64}-\frac{1}{4}\)
\(x=-\frac{15}{64}\)
Vậy x = -15/64
hok tốt
==.==
(x+1/4)=1/64
x=1/64-1/4
x=-15/64
Vậy x = ...
4x+1=64
giup mik voi
4x+1= 43
<=>x+1 = 3
<=>x= 3-1
<=>x=2
vậy x= 2
4x+1 = 64
suy ra : 64 = 43
Vậy : 3 - 1 = 2 . Nên 42+1 = 43 = 64
a, Căn ( 36x - 36 ) - căn (9x-9) - căn ( 4x-4)= 16 - căn ( x-4)
b, 1/2 căn ( x-1)- 3/2 căn ( 9x-9) + 24 căn ( x-1/64) -17
giup mình vs !
|2x+1|+|4x+1|+|6x+1|=5
|x+1/2|+|x+1/3|+|x+1/4|=x
Giai giup mik vs😊😊
a.(x-1)^x+2=(x-1)^x+6
b.(x+20)^100+/y+4/=0
giup mik vs😀😀😀
1.Tìm x biết
a,2^x=128 b,8^x-1=64
c,3+3^x=30 d,(x+2)=64
e,3^2.x=3^5 f,(2x-1^3)=343
Giải nhanh giúp mik vs mik sắp đi hc r ai nhanh mik tick cho
1.
a) \(2^x=128\)
\(2^x=2^7\)
\(=>x=7\)
b) \(8^{x-1}=64\)
\(8^{x-1}=8^2\)
\(=>x-1=2\)
\(x=2+1\)
\(=>x=3\)
c) \(3+3^x=30\)
\(3^x=30-3\)
\(3^x=27=3^3\)
\(=>x=3\)
d) \(\left(x+2\right)=64\) -> đề có thiếu không vậy?
e) \(3^2.x=3^5\)
\(x=3^5:3^2\)
\(=>x=3^3=27\)
f) \(\left(2x-1\right)^3=343\)
\(\left(2x-1\right)^3=7^3\)
\(=>2x-1=7\)
\(2x=7+1\)
\(2x=8\)
\(x=8:2\)
\(=>x=4\)
\(#Wendy.Dang\)
a,\(2^x\)=128 b,\(8^{x-1}\)=64 c,3+\(3^x\)=30 d,x+2=64
\(2^7\)=128 \(8^{x-1}\)=\(8^2\) \(3^x\)=30-3 x=64-2
=>x=7 =>x-1=2 \(3^x\)=27 x=62
x=2+1=3 \(3^x\)=\(3^3\)
=>x=3
e,\(3^2\).x=\(3^5\) f,(2x-\(1^3\))=343
x=\(3^5\):\(3^2\) 2x=1+343
x=27 2x=344
x=344:2
x=172
Cho B=1/2+1/3+1/4+...+1/64. Chứng minh B>2
Giúp mik vs mik cần gấp
3(x-1)^2-x^2+1=0
Giup mik vs =))
\(3\left(x-1\right)^2-x^2+1=0\)
\(\Leftrightarrow3\left(x-1\right)^2-\left(x^2-1\right)=0\)
\(\Leftrightarrow3\left(x-1\right)^2-\left(x-1\right)\left(x+1\right)=0\)
\(\Leftrightarrow\left(x-1\right)\left[3\left(x-1\right)-\left(x+1\right)\right]=0\)
\(\Leftrightarrow\left(x-1\right)\left(3x-3-x-1\right)=0\)
\(\Leftrightarrow\left(x-1\right)\left(2x-4\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-1=0\\2x-4=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=1\\2x=4\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=1\\x=2\end{cases}}}\)
(x-1).(y+2)=5
giup mik vs ,mik camon
(x-1).(y+2)=5
\(\Rightarrow\)x-1 và y+2 \(\in\)B(5)
\(\Rightarrow\)B(5)\(\in\)\(\left\{\pm1;\pm5\right\}\)
\(\Rightarrow\)Ta có bảng sau:
x-1 | -1 | 1 | -5 | 5 |
---|---|---|---|---|
x | 0 | 2 | -4 | 6 |
y+2 | -5 | 5 | -1 | 1 |
y | -7 | 3 | -3 | -1 |
Vậy:............
nhớ k cho mk!!!
Chúc bạn học tốt
(x-1).(y+2)=5
=>x-1;y+2\(\inƯ\left(5\right);x,y\in Z\)
Khi đó ta có bảng sau
X-1 | -1 | -5 | 1 | 5 |
X | 0 | -4 | 2 | 6 |
Y+2 | -5 | -1 | 5 | 1 |
Y | -7 | -3 | 3 | -1 |
Vậy (x;y) \(\in\){(0;-7),(-4;-3),(2;3),(6;-1)}
2 bn co ve lam dung
camon 2bn nha