2/3 x ( x -5 ) = 5/3
x - 5 = 5/3 : 2/3
x - 5 = 5/2
x = 5/2 + 5
x = 15/2
Vay x = 15/2
2/3 x ( x -5 ) = 5/3
x - 5 = 5/3 : 2/3
x - 5 = 5/2
x = 5/2 + 5
x = 15/2
Vay x = 15/2
1) 5.(x-2)+27=4x-8
2) 3.(x+1)+2.(x+2)=-13
3)(2x+4).(5-x)=0
4)x2 -3x=0
5) x2 -3x+2=0
Tìm x
X×4/5=15
6/5:x=1/3x:2/7=3/5
12/25×x=4/10
BÀI 2: tìm số hữu tỹ X , biết rằng
a,\(\frac{-3}{2}-2X+\frac{3}{4}=-2\)2
b, (\(\frac{-2}{3}x-\frac{3}{5}\))(\(\frac{3}{-2}-\frac{10}{3}\))=\(\frac{2}{5}\)
c,\(\frac{x}{2}-\left(\frac{3x}{5}-\frac{13}{5}\right)=-\left(\frac{7}{5}+\frac{7}{10}.x\right)\)
d,\(\frac{2x-3}{3}+\frac{-3}{2}=\frac{5-3x}{6}-\frac{1}{3}\)
e,\(\frac{2}{3x}-\frac{3}{12}=\frac{4}{5}-\left(\frac{7}{x}-2\right)\)
3x (1/1 x 1/2 + 1/2 x 1/3 + 1/3 x 1/4 + 1/4 x 1/5 + 1/5 x 1/6) = 3/4 Cứu pls
Tìm x :
a. 10 x X - 1 - 3 - 5 - 7 - .... - 19 = 2 + 4 + 6 + .... + 20 .
b. 3x / 2 + 3x / 6 + 3x / 12 + 3x / 20 + 3x / 30 = 10
Tnh tổng sau bằng cách hợp lí:
S = 1 x 2 x 3 + 2 x 3 x 4 + 3x 4 x 5 + 4 x 5 x 6 + … + 97 x 98 x 99
4x( 5- x) =x
1/2 ( x- 14) = 2
18/13 + 3x X = 3
1/3 9 (x + 12 ,5) =6
căn x^2-3x - căn 5(3-x)=0
bài 3
a ) 2.(5 +3 .x) + x =31
b) ( 3x -7 ) +2 . (5-2x) + 5x = 19