a: \(\left|x-7\right|+13=25\)
=>|x-7|=12
=>x-7=12 hoặc x-7=-12
=>x=19 hoặc x=-5
b: 26-|x+9|=-13
=>|x+9|=39
=>x+9=39 hoặc x+9=-39
=>x=30 hoặc x=-48
11/2-101/7:9/13-25/7:9/13
a, 7,5 : ( 9 _\(6\dfrac{13}{21}\) ) = \(2\dfrac{13}{25}\)
b, \(\dfrac{\left(1,16-x\right).5,25}{\left(10\dfrac{5}{9}-7\dfrac{1}{4}\right).2\dfrac{2}{17}}\) = 75%
Bài 1: Tìm x , biết:
1) x - 2 = -6 12) 3 . | x - 1 | - 5 = 7
2) -5 . x - ( -3 ) = 13 13) -12 . ( x - 5 ) + 7 . ( 3 - x ) = 5
3) 15 - ( x - 7 ) = -21 14) ( x - 2 ) . ( x + 4 ) = 0
4) 3 .x + 17 = 2 15) ( x - 2 ) . ( x + 15 ) = 0
5) 45 - ( x - 9 ) = -35 16) ( 7 - x ) . ( x + 19 ) = 0
6) ( -5 ) + x = 15 17) -5 < x < 1
7) 2 . x - ( -17 ) = 15 18) | x | < 3
8) | x - 2 | = 3 19) ( x - 3 ) . ( x - 5 ) < 0
9) | x - 3 | - 7 = 13 20) 2 . x2 - 3 = 29
10) 72 - 3 . | x + 1 | = 9 21) -6 . x - ( -7) = 25
11) 17 - ( 43 - | x | ) = 45 22) 46 =- ( x - 11 ) = -48
a, -13/30 + 11/20 - 7/15
b, -5 /72 : ( 3/8 . 7/9 )
c, -23/25 .10/17 + -23/25 . 3/13 + -27/25
A) x -(25-x)=x-15
B) x-8=-13-8
C) x-(-15)=5-(-19)
D) (x+35)=2x+15+(13-4)
E) 5-2x=15-(-9)-3x
G) x+135=3x-15
Thực hiện phép tính:
(-7+|13|) - (13-|-7|-25) - (25+|-10|-9)
Mình đang cần gấp giúp mình nhé
Tìm x:
a, 2x - 13 = 7
b, 23-x=31-(-9)
c, /x+13/-4=16
d, 45chia hết cho x ; x > 15
a , ( 15 - x ) + ( x - 12 ) = 7 - ( - 5 + x )
b , x - { 57 - [ 42 + ( - 23 - x ) ] } = 13 - { 47 + [ 25 - ( 32 - x ) ] }
c , ( x - 3 ) + ( x - 2 ) + ( x - 1 ) + ... + 10 + 11 = 11
d , x + ( x + 1 ) + ( x + 2 ) + ... + 2003 = 2003
e , ( x² + 3x + 9 ) chia hết ( x + 3 )
g , ( 2x² - 10x + 5 ) chia hết ( x - 5 )
Bài 1: Tính
a, (4/1/9+3/1/4). 2/1/4+2/3/4
b, 9/23. 5/8+ 9/23. 3/8 - 9/23
c, 1+ (9/10 - 4/5) : 3/1/6
d, (-7+/13/) - (13- / -7/ -25) - (25 +/- 10/ -9)
