3/4xX-1=1/2xX
mn lm nhanh giúp mik vs
1/4+1/3xX=1/2
mn lm nhanh giúp mik vs
\(\dfrac{1}{4}+\dfrac{1}{3}\times X=\dfrac{1}{2}\\ \dfrac{1}{3}\times X=\dfrac{1}{2}-\dfrac{1}{4}=\dfrac{1}{4}\\ X=\dfrac{1}{4}:\dfrac{1}{3}=\dfrac{1}{4}\times3=\dfrac{3}{4}\)
D=1/1.5+1/5.9+...+1/41.45 Mn lm nhanh giúp mik vs ạ
D=1/1.5+1/5.9+...+1/41.45
4D=4/1.5+4/5.9+...+4/41.45
4D=1-1/5+1/5-1/9+...+1/41-1/45
4D=1-1/45
D=44/45:4=11/45
1/6+1/12+1/20+1/30+...+1/420 mn lm nhanh giúp mik vs
\(A=\dfrac{1}{6}+\dfrac{1}{12}+\dfrac{1}{20}+...+\dfrac{1}{420}\\ \Rightarrow A=\dfrac{1}{2\times3}+\dfrac{1}{3\times4}+...+\dfrac{1}{20\times21}\\ \Rightarrow A=\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+...+\dfrac{1}{20}-\dfrac{1}{21}\\\Rightarrow A=\dfrac{1}{2}-\dfrac{1}{20}=\dfrac{9}{20}\)
3xX+X=20
mn lm nhanh giúp mik vs
3 x X + X = 20
(3+1) x X =20
4 x X = 20
X= 20:4
X=5
X+X:0,5=27
mn lm nhanh giúp mik vs ak
\(X+X:0,5=27\)
\(\Rightarrow X\left(1+\dfrac{1}{0,5}\right)=27\)
\(\Rightarrow X\left(1+2\right)=27\)
\(\Rightarrow3X=27\Rightarrow X=27:3=9\)
a)3/4+1/4xX=1/2+1/2xX
b) (x+2)/0.5=(2x+1)/2
(2x - 3) . 4,8 = ( 3x + 1 ) . (-2,4)
mn ơi, giúp mik vs nhanh hộ mik nha <3
\(\left(2x-3\right)\cdot4,8=\left(3x+1\right)\cdot\left(-2,4\right)\)
\(9,6x-14,4=-7,2x-2,4\)
\(9,6x+7,2x=14,4-2,4\)
\(16,8x=12\)
\(x=\dfrac{12}{16,8}=\dfrac{5}{7}\)
tìm số tự nhiên X:
a, (4xX-1)^2=9
b,3^2xX-3=9
a) \(\left(4x-1\right)^2=9\)
\(\left(4x-1\right)^2=3^2\)
\(\Rightarrow4x-1=3\)
\(\Rightarrow4x=4\)
\(\Rightarrow x=1\)
vay \(x=1\)
b) \(3^{2x-3}=9\)
\(3^{2x-3}=3^2\)
\(\Rightarrow2x-3=2\)
\(\Rightarrow2x=5\)
\(\Rightarrow x=\frac{5}{2}\)
vay \(x=\frac{5}{2}\)
a. (4xX-1)^2 = 9
(4xX-1)^2 = 3^2
4xX-1 = 3
4xX =3+1
4xX = 4
X =4:4
X = 1
a)(4.x-1)^2=9 b)3^2.x-3=9
(4.x-1)^2=3^2 3^2.x=9+3
4.x-1=3 3^2.x=12
4.x=3+1 9.x=12
4.x=4 x=12:9
4/4=x x=4/3
x=1 vậy x=4/3
vậy x=1
nhớ tk nhe mn
Cho A=3/22+8/32+15/42+....+20232-1/20232 Không là số tự nhiên (lm nhanh giúp mik vs ạ )