a: =>-2x+17=9
=>-2x=-8
hay x=4
b: =>15-x=-10
hay x=25
c: =>7x=-4
hay x=-4/7
d: =>\(9x^2=81\)
hay \(x\in\left\{3;-3\right\}\)
g: \(\Leftrightarrow2x-4+5⋮x-2\)
\(\Leftrightarrow x-2\in\left\{1;-1;5;-5\right\}\)
hay \(x\in\left\{3;1;7;-3\right\}\)
a) -2x - (-17)= 9 b) 11 + (15 – x) = 1
| c) 53 – 7x = 57 : 55 |
b) 11 + (15 – x) = 1
d) 29 +9.x2 = 110
e) (2x-4).(3-x) = 0
g) 2x + 1 chia hết cho x -2
a) -2x - (-17)= 9 b) 11 + (15 – x) = 1
| c) 53 – 7x = 57 : 55 | d) 29 +9.x2 = 110 |
e) (2x-4).(3-x) = 0
| g) 2x + 1 chia hết cho x -2 |
Bài 1:
a)-2x-3.( x-17 )= 34-2.( -x+25 )
b)17x+3.( -16x-37 )= 2x+43-4x
c){-3x+2. [ 45-x-3 ( 3x+7 ) -2x]+4x} = 55
g)-103-57: [ 5.( 2x-1 )2-( -9 )0 ]
Bài 2:
a)-5.( -x+7 )-3.( -x-5 )=-4.( 12-x )+48
b)7.( -x-7 )-4.( -2x-11 )=7.( 4x+10 )+9
c)-2.( 15-3x )-4.( -7x+8 )=-5-9.( -2x+1 )
d)5.( -3x-7 )-4.( -2x-11 )=7.( 4x+10 )+9
e)4( x-2 )2-13=( -3 )2.2-11.( -3 )
f)-52-( 2x-1 )3=( -13 ).( -3 )
Bài 1: Thực hiện phép tính
a) (45-25).(-11)+29.(-3-17)
b) (36-6).(-5)+21.(-17-3)
Bài 2: Tìm x, biết:
a) -4.(2x+9)-(-8x+3)-(x-13)=0 b) 7x.(2+x)-7x.(x+3)=0
Bài 1:
a,-[x+84]+213=-16
b,11-[-53+x]=97
c,/x+10/=105-[-100]
d,/17-x/-78=99-176-[34-51]
e,/x-4/-x+4=0
g,6+/6-2x/-2x=0
h,/8x-9/=/6-7x/
i,/3x+15/-/5-2x/=0
A) 78-2x=42
B)6x+39=75
C) 2^3.x+ 2.x=25.2^2
D) 21+7x = 56
E) 5x +2x = 6^2-5^0
F)15x + 3x = 450 : 2+9
G) 6x+x=5^11: 5^9+3^1
H) 5x + 3x=3^11: 3^8.4+12
i) 2^3.x + 2^2.x =136-2^20 : 2^16
j) 7x -x= 5^21: 5^19+3.2^2
k) 7x - 2x= 6^17: 6^15 + 44 :11
l) 0: x =0 m) 3^x=27 n) 4^x= 64
o) 2^x = 32 p) 9^x-1=81 q) x^4=16
r) 3^x :3^
p) 9^x-1=81
q) x^4=165=1
timx
a. 7x-2x bang 6 17 chia 6 15+44 chia 11
b. 3 x bang 9
c. 4 x bang 64
d. 9 x-1 bang 9
e. x 4 bang 16
f. 2 x chia 2 5 bang 1
a,( x - 29 ) - ( 17 - 38 ) = -9
b, ( x + 5) + ( x - 9 ) = x + 2
c, ( 27 - x ) + ( 15 + x ) = x- 24
d, |2x - 7|- 9 =20
e, x^2 - 2x + 4 = -2x + 7
g, ( x + 1) + (x + 3) + ( x + 5 +...+ ( x + 99) = 0
GIÚP MÌNH 5 BÀI NÀY NHÁ ! TICK CHO
a/5(x-2)-(x-3)=15
b/-17 bé bằng x < 15 và đồng thời x là bội của 5
c/11 chia hết cho 2x+3
d/-29 chia hết 2x-1
e/ 4x+19 chia hết 2x-3
CẢM ƠN
