a, => x = 14 : (-2) = -7
b, => -x = 16
=> x = 16 : (-1) = -16
c, => 3x = 15
=> x = 15 : 3 = 5
Tk mk nha
a, => x = 14 : (-2) = -7
b, => -x = 16
=> x = 16 : (-1) = -16
c, => 3x = 15
=> x = 15 : 3 = 5
Tk mk nha
tìm x, biết:
a) (2x-1) mũ 20= (2x-1)mũ 18
b) ( 2x-3) mũ 2= 9
c) (x-5) mũ 2 = (1-3x)mũ 2
bài 2: Chứng minh rằng:
a) 15 mũ 20 - 15 mũ 19 chia hết cho 14
b) 3 mũ 20 + 3 mũ 21+ 3 mũ 22 chia hết cho 13
c) 3+ 3 mũ 2 + 3 mũ 3+.......+ 3 mũ 2007 chia hết cho 13
7 mũ 1+ 7 mũ 2+ 7 mũ 3+.........+ 7 mũ 4n chia hết cho 400
Tìm x
a) 5.x^3 - 5 = 0
b) ( x+1)^2 = 16
c) ( x+1)^3 = 27
d) ( x-1)^3 = 343
e) (2x - 1^3) = 125
Tìm x, y ∈ N biết
a) (x - 2)(y + 1) = 14
b) (x + 1)(y + 2) = 20
c) (2x + 1)(y - 2) = 48
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 - 261 = -21
b) 15 . (-2) - x = 45
c) -18 + ( 7 - x)^2 = -2
d) ( 2x - 1 ) chia hết ( x +1)
Bài 2:
a,x-2=-6-5x-16
b,-5x-[-3]-x=13-x
c,15-[x-7]=-21-x
d,3x+17=2+3x+15
e,x-45-[x-9]=-35-x
f,[-5]+x=15-x-2x
g,2x-[-17]=15
a) 42-x=5
b) 15.(x+4)=75
c) 27+3x=9^8.9^7
d) x+18=12
e) 2x-15=-19
f) 36 :(x^3-12)=-3
g)x+15=35
h) 2x-13=3^2
a, | 2x - 1 | = 7 - x
b, (2x- 15)5 =(2x - 15)3
c, (-3x + 2)4 = (3x-2)10
d, x + (x+1) + (x+2) + ...................+(x+2013)
tính x đi ae
Tìm x
a) ( 2x -1)+3/15= 3/2
b) x+ 46/15= 1,5
c) ( -2x +1) + 3/15= 5/3
d) -13/3 -2x -1= 0,6
e) 3x -1/2x = 7/2-3
f) x÷5=6÷7
g) 2x-1/3 = 16/3
Tìm x
a, (2x - 15) 5 = ( 2x - 15) 3
b, x + ( x + 1 ) + ( x + 2 ) + ... + ( x + 2013) = 2035147