\(2^x-15=17\)
\(2^x=15+17\)
\(2^x=32=2^5\)
Vậy x=5
\(2^x-15=17\)
\(\Rightarrow2^x=32\)
\(\Rightarrow2^x=2^5\)
\(\Rightarrow x=5\)
Vậy \(x=5\)
tìm xϵz :
a)15 - ( x - 7 ) = -21
b) 3x + 17 = 2
c) 45 - ( x - 9 ) = -35
d)(-5) + x = 15
e) 2x - (-17) = 15
g) | x - 2 | = 3
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
1) a) (-17)+5+8+17+(-3) b)25*2^2-(15-18)+(12-19+10
2) a) x+5=20-(12-7) b) 35-3gia tri tuyet doi cua x =5*(2^3-4)
Tìm X biết:
1) X - 105 : 21 = 15
2) ( X - 105 ) : 21 = 15
3) ( 32 + X ) : 17 = X
4) 1818 : ( 6X - 37 ) = 18
Tìm x:
a. 12x + 19x - 123 = 280
b) 5 - (17 - 3) = x - (2 - 15)
tìm số tự nhiên x biết
a, 2x - 15 =17
b, ( 7x - 11)3 = 25 x 52+200
c,(2x - 15 )5 = 2x - 153
Tìm x, biết:
a) 2 . ( x - 5 ) - 17 = 25
b) 3 . ( x + 7 ) - 15 = 27
Bai 1 : Tinh a) 24 - (-15) - 2 b) (-85) + 10 - (-85) - 50 c) 71 - (-30) - (+18) + (-30)
d) -(30) - (+37) + (+37) + (-85) e) (35-815) - (795-65) g) (2002-79+15) + (-79+15)
h) -(515-80+91) - (2003+80-91)
Bai 2: Tim x,biet a) 25 - (30+x) = x - (27-8) b) (x-12) - 15 = (20-17) - (18+x) c) 15 - x = 7 - (-2) d) x - 35 = (-12) - 3 e) I5-xI - 26 = - 15
tìm GTNN của bt
a)A=2x2 - 15
b) B=2(x+1)2 - 17
