ta có: 5*(x-7)=0
(x-7)=0
x =7
ta có: 25*(x-4)=0
x-4=0
x =4
ta có: 5*(x-7)=0
(x-7)=0
x =7
ta có: 25*(x-4)=0
x-4=0
x =4
ta có: 5*(x-7)=0
(x-7)=0
x =7
ta có: 25*(x-4)=0
x-4=0
x =4
ta có: 5*(x-7)=0
(x-7)=0
x =7
ta có: 25*(x-4)=0
x-4=0
x =4
bài 19: tìm x
a) 5 . ( x - 7 ) = 0
b) 25 ( x - 4 ) = 0
c) ( 34 - 2x ) . ( 2x - 6 ) = 0
d) ( 2019 - x ) . ( 3x - 12 ) 0
e) 57 . ( 9x - 27 ) = 0
f) 25 + ( 15 - x ) = 30
g) 43 - ( 24 - x ) = 20
h) 2 . ( x - 5 ) - 17 = 25
i) 3 . ( x + 7 ) - 15 = 27
j) 15 + 4 . ( x - 2 ) = 95
k) 20 - ( x + 14 ) = 5
l) 14 + 3 . ( 5 - x ) = 27
1, 5.[X-7]=0 2, 25.[x-4]=0 3, 49.[6.x-12]=0 4, 57, [ 9x-27]=0 5, 25+[15-x]=30 6,43-[ 24-x]=20 7,2.[x+7]-17=25 8, 3.[x+7]-15= 27 9,15+4.[x-2]=95 10, 20-[x+14]=5 11, 24+3.[ 5-x]= 27
tìm x biết:
(3x-1) [- 1/2x+5]=0
1/4+1/3:(2x-1)=-5
[2x+3/5]2 - 9/25=0
-5(x+1/5)-1/2(x-2/3)=3/2x - 5 /6
[x+1/2]x [2/3-2x]=0
17/2-|2x-3/4|=-7/4
2/3x-1/2x =5/12
(x+1/5)2+17/25=26/25
[x.44/7+3/7].11/5-3/7=-2
3[3x-1/2]+1/9=0
Tim x : / 5( x - 7 ) = 0 / 25. ( x - 4 ) = 0
tìm số nguyên x , biết
| x + 2 | = 0
|x - 3 | = 7 - ( -2 )
( 7 - x ) - ( 25 + 7 ) = -25
| x - 3 | = | 5 | + | -7 |
| x - 5 | = | -7 |
4 - ( 7 - x ) = x - ( 13 - 4)
(x-2).(x+14)=0
(x-2).(x+4)=0
(7-x).(x+19)=0
(x-3)(x-5)<0
2x^2-3=29
-6x-(-7)=25
46-(x-11)=-48
Tìm x:
a) 1/3 .x +2/5 (x+1)=0
b)2/3.x+1/4= 7/12
c) 3/5. x -1/2=1/7
d)1/4 + 1/3 :3x = -5
e) 1 - ( 5 3/8 + x - 7 5/24)=0
f) x - 25%x = 0,5
Tìm x
5 ( x - 7 ) = 0
25 ( x - 4 ) = 0
342 ( 2 x - 6 = 0
2016 ( 3 x - 12 ) = 0
47 ( 5 x - 15 ) = 0
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