Bai 1: Tính nhanh
a) 5x+x = 39-3^11:3^9
=>5x+x=39-3^2
=>5x+x=39-9
=>5x+x=30
=>6x=30
=>x=5
b) 7x-x = 5^21:5^19+3*2^2-7^0
=>7x-x=5^2+3x4-1
=>7x-x=25+12-1
=>7x-x=37-1
=>7x-x=36
=>6x=36
=>x=6
c) 0:x = 0
=>x=0:0
=>x=0
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
-5x- 16 = 40 + x
4x - 10 = 15 - x
- 12 ( x - 5 ) + 7 ( 3 - x ) = 5
( x - 2 ) . ( x + 15 ) = 0
( x - 2 ) . ( x2 - 1 ) = 0
( 7 - x ). | x + 19 | = 0
( x - 3 ) . ( x - 5 ) < 0
(Giúp mifh với )
13) -12( x - 5 ) + 7( 3 - x ) = 5
14) ( x - 2 ) . ( x + 4 ) = 0
15) ( x - 2 ) . ( x + 15 ) = 0
16) ( 7 - x ) . ( x + 19 ) = 0
17 ) -5 < x < 1
18) \(\left|x\right|\) < 3
19) ( x - 3 ) ( x - 5 ) < 0
20) 2x2 - 3 = 29
Tìm x
1) -12(x-5)+7(3-x)=5
2) (x-2)*(x+4)=0
3) (x-2)*(x+15)=0
4) (7-x)*(x+19)=0
5) (x-3)*(x-5)<0
Tìm x biết
a ) ( 2x - 1 ) . ( 5x + 2 ) = 0
b ) 3/7 + 3/7 : x = -1/2 - ( -3/4 )
c ) ( 3x + 5 ) . ( 2x - 3 ) < 0
tìm x biết 2016x +(7/12+4/21+2/24+11/30+3/41+15/56)-(2/3+2/4+2/5)=0
Tìm x \(\in\)\(\in\)
Z , biết
1) -5x - ( -3 ) = 13 10 ) 3 . I x - 1 I - 5 = 7
2) 15 - ( x - 7 ) = -21 11) -12 ( x - 5 ) + 7 ( 3 - x ) = 5
3) 45 - ( x - 9 ) = -35 12) ( x - 2 ) . ( x + 4 ) = 0
4) ( - 5 ) + x = 15 13) ( x - 2 ) . ( x + 15 ) = 0
5) 2x - ( -17 ) = 15 14) ( 7 - x ) . ( x + 19 ) = 0
6) Ix-2I = 3 15 ) -5 < x < 1
7) I x - 3 I - 7 = 13 16) IxI < 3
8) 72 - 3 . I x + 1 I = 9 17) ( x - 3 )( x - 5 ) < 0
9 ) 17 - ( 43 - I x I ) = 45 18) 2x2 - 3 = 29
19) -6x - ( - 7 ) = 25 20) 46 - ( x - 11 ) = -48
cứu với , làm tất hộ vs
tìm xϵz , biết :
a) (x - 2 ) . ( x + 4 ) = 0
b) (x - 2 ) . ( x + 15 ) = 0
c ) ( 7 - x ) . ( x + 19 ) = 0
d) -5 < x < 1
e) |x| < 3
g ) ( x - 3 ) . ( x - 5 ) < 0
tìm x , biết
a) 3/4 - 3/4 : x = 1/2
b) -12 x ( x - 5 ) + 7 . ( 3 - x ) = 5
c) / 7x + 3 / = 66
d ) ( x - 7 ) . ( x +3 ) < 0
