\(\Leftrightarrow3^4+2^x=25+2^2.3.5\)
\(\Leftrightarrow81+2^x=25+60\)
\(\Leftrightarrow81+2^x=85\)
\(\Leftrightarrow2^x=4\)
\(\Leftrightarrow2^x=2^2\)
\(\Rightarrow x=2\)
\(\Leftrightarrow3^4+2^x=25+2^2.3.5\)
\(\Leftrightarrow81+2^x=25+60\)
\(\Leftrightarrow81+2^x=85\)
\(\Leftrightarrow2^x=4\)
\(\Leftrightarrow2^x=2^2\)
\(\Rightarrow x=2\)
Tìm số nguyên x biết:
1, -x +(-53) =(-42) - 41
2. -12 - x= -32 +19
3.453+x = -443+(-199)
4. -12-x = -32 +19
5. 32.(-2) +x = -120 -5.(-85)
6. -2x + 15.(-4) = 21.(-8) -12
Tìm x thuộc N:
a) (x-1)5=x-1 ; b) (3x - 1)2=121
c)42x +1 =64 ; d) (x-2)5 =32
e) 7x ×72 = 2744×75
Tìm x :
\(\frac{7^{x+2}+7^{x+1}+7^x}{57}=\frac{5^{2x}+5^{2x+1}+5^{2x+3}}{131}\)
Tìm x biết
2x/15+2x/35+2x/63+....+2x/195=4/5
Chứng minh rằng 1/2-1/4+1/8-1/16+1/32-1/1/64<1/3
Tìm x :
\(\frac{\left(7^{x+2}+7^{x+1}+7^x\right)^{57}}{57}=\frac{5^{2x}+5^{2x+1}+5^{2x+3}}{131}\)
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 )
Tìm x
a)5x=125
b)32x=81
c)52x+3-2*52=52*3
rút gọn
A = 72^3.5^42/108^4
B= 45^3.20^4.18^2/180^5
C= 11.3^22.3^7-9^15/(2.3^14)^2
Tìm X :
1) ( 2016 + X ) : 169 = X
2) 51 + ( 26 - 3X ) : 5 = 55
3) [ ( X + 32 ) - 17 ] . 2 = 42
viết gọn kết quả phép sau dưới dạng lũy thừa
a] 12 mũ 2x 3 mũ 2 x2 mũ 3
b] 8 mũ 3 x 3 mũ 2x 6 mũ 3
c] 5 mũ 32 . 5 mũ 2
d] 100 mũ 6 x2 mũ 3
e] 100 mũ 2 chia 10 mũ 2 chia 5 mũ 2
f] 121 mũ 3 -11 mũ 2