Tính M=4÷(7×31)+6÷(7×41)+9÷(10×41)+7÷(10×57)
\(3^{x+2}+3^{x+1}+3^4=405\)
\(3^{x+1}.3+3^{x+1}+81=405\)
\(3^{x+1}.\left(3+1\right)=405-81\)
\(3^{x+1}.4=324\)
\(3^{x+1}=81\)
\(3^{x+1}=3^4\)
\(x+1=4\)
\(x=3\)
tìm x thuộc Z
-2(-34-7x)+5c(-3x-14)=2
-13(-7+3x)-(-985+91)=20(-34-x)-6(3x-16)
Tìm x biết:
a) 40 - 3 . (4 - 3x) = 8x - 2
b) -34 + 3 . (-x + 7) = 4x - 18
c) 4 . (3x - 2) = -3 . (x - 1) + 4
a) 16+|2x+5|-|x-1|=5x+9
b) 105+|3x-7|+|5x-2=405
c) 302-|x+4|-|3x-7|=9
d) 415+|4-x|+|8x-2|=515
Tìm x ∈ N , biết.
a) 3 x + 1 : 3 4 = 81
b) 3 x + 3 . 3 x + 1 = 729
c) 2 x + 3 . 2 x = 128
d) 23 + 3 x = 5 6 : 5 3
e) 2 x + 2 x + 4 = 272
Tìm x ∈ N, biết.
a, 3 x + 1 : 3 4 = 81
b, 3 x + 3 . 3 x + 1 = 729
c, 2 x + 3 . 2 x = 128
d, 23 + 3 x = 5 6 : 5 3
e, 2 x + 2 x + 4 = 272
Tìm x, y biết
a,/2x/+/y-3/=0
b,/3x-6/+/3x-y+5/=0
c,34-2./9-3x/=0
B1: Tìm x:
1/ \(\dfrac{x+3}{15}\) = \(\dfrac{1}{3}\) - \(\dfrac{1}{15}\)
2/ (2x - 5) = (x - 3) = 0
3/ (3x - 4) - (2x - 5) = 3
4/ (2x + 1) x (\(\dfrac{1}{2}\)x - 1) = 0
tìm số nguyên x
-2x-(x-17)=34-(-x+25)
17x-(-16x-37)=2x =43
-2x-3.(x-17)=34-2(-x+25)
17x+3.(-16x-37)=2x+43
{-3x+2.[45-x-3(3x+7)-2]+4}
55-103-57：[-2.（2x-1)2.(-9)0=-106
Tìm x, biết:
a ) 3 4 + − 1 2 x = 1 b ) 1 6 : x − 1 3 = 1 2 c ) 2 5 − 3 x = 1 2 d ) 11 2 − 1 3 . ( x + 1 ) = 3 1 2
tìm số ngyên x :
a) -2x-(x-17)=34-(-x+25)
b) 17x-(-16x-37)=2x+43
c) -2x-3.(x-17)=34-2(-x+25)
d) 17x+3.(-16x-37)=2x+43-4
e) {-3x+2.[45-x-3(3x+7)-2x]+4x}=55
g)103-57; [-2.(2x-1)2 -(-9)0 ] =-106