A. 7 + 48 : x = 45 : 5 = 9 => 48 : x = 9 - 7 = 2 => x = 48 : 2 = 24.
G=3/2.5+3/5.7+3/7.9+...+3/2015.2017
H=3/2.5+3/5.7+3/7.9+...+3/2015.2017
(3/3.6+3/3.9+...+3/30.33). x+2/5=7/8
(1/8+1/24+1/48+1/440). x=5/9
x:3/4+2,5=15%+16
khó wá giúp mình với huhu
a) 2/2.5 + 2/5.8 + 2/8.11 + ... + 2/x.(x+3)=7/23
b) 3/4 . x - 1/5 = 7/4 . x + 11/5
Tìm các số nguyên x, y; biết rằng:
a) x/-6=-15/45
b) x/5=16/25
c) 5/x-3=20/-12
d) 2/5.x=6/35
tìm x
A,5.(x+2)=25
b,3.(2-x)+15=(-3).7
c,3 mũ x-2-7=2 mũ 2.5
tìm x :
a |x-5|+2x+3=11 b x-7+|3-x|=10. c 5^2x-3-2.5^2=5^2.3
a,210-5(x-11)=200
b,(2x+1):7=2^2+3^2
c,450:[41-(2x-5]=3^2.5
d,(5x-9).7+3=80
a)Chung minh: (54+55-2.54)chia het cho 20
b)tim x;y thuoc N,biet: (x-3)(2x-5)=7
tim x la stn biet
a, 2.52=53
b,[3(x+2):7].4=120
c,(x-5)4=(x-5)2
d,123-5.(x+4)=38
Tìm x, biết :
a. 70 - 5. ( x - 3 ) = 45
b. 10 + 2.x = 45 : 43
c. 60 - 3 .x - 2 = 51
d. 4.x - 20 = 25 : 23
e. 2x.4 = 16
f. 3x.3 = 243
g. 64.4x = 168
h. 2x.162 = 1024
