a)(2*x-7)^5=243
=>(2*x-7)^5=3^5
=>2*x-7=3
=>2*x=3+7
=>2*x=10
=>x=10:2
=>x=5
Vậy x=5
\(( 2.x -7 )^5 = 3^5 \)
\(2.x -7 = 3\)\(2.x=3+7\)\(2.x = 10\)\(x=10:2\)\(x=5\)Vậy x = 5Chúc bn học tốt
So sánh:
a, \(\left(\frac{1}{80}\right)^7\) với \(\left(\frac{1}{243}\right)^6\)
b, \(\left(\frac{3}{8}\right)^5\) với \(\left(\frac{5}{243}\right)^3\)
tìm số x biết
a) \(\frac{7}{9}:\left(2+\frac{3}{4}x\right)+\frac{5}{9}=\frac{23}{27}\) b) \(\frac{-2}{3}.x+\frac{1}{5}=\frac{3}{10}\) c) \(\left|x\right|-\frac{3}{4}=\frac{5}{3}\)
tìm x, biết
a) 2480 - 4710 : 3 + [ 200 - ( x - 5 ) ] = 1010
b) 0,5x . \(\left(\dfrac{8}{5}:1\dfrac{1}{2}+\dfrac{1}{60}\right)=\dfrac{7}{60}.\left(2,91+0,09\right).4\)
Tìm STN x biết rằng:
a)\(720:[41-\left(2x-5\right)]=2^3\cdot5\)
b)\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+100\right)=5+50\)
d)\(\left(x+3\right)^{10}=\left(x-3\right)^{17}\)
Tìm x:
a,\(x^2\) - 9 = 0
b,\(\left(x-3\right)^2-25=0\)
c,\(\left(x-3\right)\left(2x-5\right)=0\)
d,\(\left(x-3\right)\cdot x-2\left(x-3\right)=0\)
e,\(3x\left(x-1\right)-5\left(1-x\right)=0\)
g,\(x^2+6x-7=0\)
h,\(2x^2+5x-7=0\)
Tìm x, biết:
2) \(\left(\dfrac{1}{6}+2\dfrac{1}{2}-10,75\right).x-7=\left(\dfrac{2}{5}+\dfrac{3}{8}+0,025\right):0,1\)
Tìm x biết :
a) \(x.\left(x-1\right)-\left(x-1\right)^2\)
b) |x+1|+|x+2|+|x+7|=5x-10
1)tìm x\(\in\)Q biết:
a)\(\left(5\cdot x+1\right)^2=\dfrac{36}{49}\)
2)tìm x,y biết:
a)\(x^2+\left(y-\dfrac{1}{10}\right)^4=0\)
b)\(\left(\dfrac{1}{2}x-5\right)^{20}+\left(y^2-\dfrac{1}{4}\right)^{40}\le0\)
