2x-20=35:33
Tìm x, biết:
a) 4 x + 18 : 2 = 13
b) 2 x - 2 0 = 3 5 : 3 3
c) 48 - 3 ( x + 5 ) = 24
d) ( 15 + x ) : 3 = 3 15 : 3 12
Tìm x, biết:
a, 4x+18:2 = 13
b, 48 – 3(x+5) = 24
c, 2 x - 2 0 = 3 5 : 3 3
d, (15+x):3 = 3 15 : 3 12
a, 4x+18:2 = 13
4x+9 = 13
x = 1
b, 48 – 3(x+5) = 24
3(x+5) = 24
x + 5 = 8
x = 3
c, 2 x - 2 0 = 3 5 : 3 3
2x – 1 = 3 2
2x = 10
x = 5
d, (15+x):3 = 3 15 : 3 12
(15+x):3 = 3 3
(15+x):3 = 27
15 + x = 54
x = 39
2x-x0=35:33
Helpp!!!
2x-x0=35:33=32=9
=>2x-1=9
=>2x=9+1=10
=>x=10:2=5.
\(2x-x^0=3^5:3^3\\ 2x-1=3^{5-3}\\ 2x-1=3^2\\ 2x-1=9\\ 2x=9+1\\ 2x=10\\ x=\dfrac{10}{2}\\ x=5\)
Lời giải:
$2x-x^0=3^5:3^3$
$2x-1=3^2=9$
$2x=10$
$x=5$
\(\dfrac{2x+19}{21}-\dfrac{2x+17}{23}=\dfrac{2x+7}{33}-\dfrac{2x+5}{35}\) tìm x
\(\dfrac{2x+19}{21}-\dfrac{2x+17}{23}=\dfrac{2x+7}{33}-\dfrac{2x+5}{35}\)
\(\Rightarrow\dfrac{2x+19}{21}-\dfrac{2x+17}{23}-\dfrac{2x+7}{33}+\dfrac{2x+5}{35}=0\)
\(\Rightarrow\left(\dfrac{2x+19}{21}+1\right)-\left(\dfrac{2x+17}{23}+1\right)-\left(\dfrac{2x+7}{33}+1\right)+\left(\dfrac{2x+5}{35}+1\right)=0\)
\(\Rightarrow\dfrac{2x+40}{21}-\dfrac{2x+40}{23}-\dfrac{2x+40}{33}+\dfrac{2x+40}{35}=0\)
\(\Rightarrow\left(2x+40\right)\left(\dfrac{1}{21}-\dfrac{1}{23}-\dfrac{1}{33}+\dfrac{1}{35}\right)=0\)
\(\Rightarrow2x+40=0\Rightarrow x=-20\)( do \(\dfrac{1}{21}-\dfrac{1}{23}-\dfrac{1}{33}+\dfrac{1}{35}>0\))
Ta có: \(\dfrac{2x+19}{21}-\dfrac{2x+17}{23}=\dfrac{2x+7}{33}-\dfrac{2x+5}{35}\)
\(\Leftrightarrow\left(2x+40\right)\left(\dfrac{1}{21}-\dfrac{1}{23}-\dfrac{1}{33}+\dfrac{1}{35}\right)=0\)
\(\Leftrightarrow2x+40=0\)
hay x=-20
1.(x+1)/35 + (x+3)/33 = (x+5)/33 + (x+7)/20
2. (X+1)/12+ (X+2)/13 = (X+3)/14+ (X+4)/15
3. (X-85)/15+ (X-75)/13+(X-67)/11+ (X-64)/9=10
4. (X-1)/13-(2X-13)/15=(3X-15)/27- (4X-27)/29
2: \(\Leftrightarrow\left(\dfrac{x+1}{12}-1\right)+\left(\dfrac{x+2}{13}-1\right)=\left(\dfrac{x+3}{14}-1\right)+\left(\dfrac{x+4}{15}-1\right)\)
=>x-11=0
=>x=11
3: \(\Leftrightarrow\left(\dfrac{x-85}{15}-1\right)+\left(\dfrac{x-74}{13}-2\right)+\left(\dfrac{x-67}{11}-3\right)+\left(\dfrac{x-64}{9}-4\right)=0\)
=>x-100=0
=>x=100
Tìm x thuộc N biết :
x-20/11*13-20/13*15-20/15*17 -... - 20/33*35 = 3/11
Nhân đó bạn , làm giúp mình với !
Tìm kết quả của phép nhân sau:
(33...3) x (33...3)
Trong đó, mỗi nhóm: (33...3) có 50 chữ số 3.
30*31*32*33*35*a= 33390*20
Tìm
30 x 31 x 32 x 33 x 35 x a = 33390 x 20.
30 x 31 x 32 x 33 x 35 x a = 667800.
a = 667800 : ( 30 x 31 x 32 x 33 x 35 ).
a = 667800 : 34372800.
a = 0,0194... ( chia dư mãi ).
Kích mình nha!!!
A = 4/5+32/35+20/21+32/33+140/143+64/65
Tìm x:
5\(^{10}\) : 5\(^8\) + x = 3\(^{20}\) : (-3)\(^{18}\) - 2\(^{35}\) : (-2)\(^{33}\)
\(5^{10}:5^8+x=3^{20}:\left(-3\right)^{18}-2^{35}:\left(-2\right)^{33}\\ \Leftrightarrow5^2+x=3^2+\left(-2\right)^2\\ \Leftrightarrow25+x=13\\ \Leftrightarrow x=-12\)
5^10/5^8+x=3^20/(-3)^18-2^35/(-2)^33
5^2+x=(-3)^2+2^2
25+x= 9+4
25+x=13
x=13-25
x=-12
vậy x=-12