3^2.x+3^2.x=36.2^2-13
x.(3^2+3^2)=131
x.18=131
x=131:18
3^2.x+3^2.x=36.2^2-13
x.(3^2+3^2)=131
x.18=131
x=131:18
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
Tìm x
6-2(x+4)=-4
6 chia hết x
2x-15:5=-7
231-(x-6)=1339:13
(x-12):6=3 - x^2-1=3
28-x^3=1
(x+2)^3=27
81-(x-5)^2=56
x^2=9
14 chia hết x +3
Tìm x ,bt ;
a/ (19 . x + 2 . 5^2 ) : 14 = (13 -8 )^2 - 4^2
b/2 .3^x = 10 . 3^12 + 8 . 27^4
Tìm x , y biết:
3) ( x - 2 ) ( y - 1 ) = 11
4) ( x - 3 ) ( x - 2 ) = 13
Tìm x ,bt ;
a/ (19 . x + 2 . 5^2 ) : 14 = (13 -8 )^2 - 4^2
b/2 .3^x = 10 . 3^12 + 8 . 27^4
1. 210 x 13 + 210 x 65/ 28 x 104
2. ( 1+2 + 3 +.............+ 100) x (12 + 22+ 32+............+ 102) x ( 65 x 111- 13x 15 x 37)
3. 11x322 x 37 - 915 / 2 x 314)2
Help!!!!!!!!!!!!!!
2x-13=17+x
17-{x-(-x-(-x))}=-16
x-{(-x+(x+3))-((x=3)-(x-2))}
B = ( 1+2+3+...+100 )x(\(1^2+2^2+3^2+...+100^2\)) x ( 65*11-13*15*37)
Đề bài: Tìm x, biết:
a) 390 - ( x - 7) = 13 mũ 2 : 12
b) ( x - 35 . 2 mũ 2) : 7= 3 mũ 3 - 24
c) x - 6 : 2 - ( 4 mũ 2 . 3 - 24) : 2 : 6 = 3
d) 4 . x - 5 = 5 + 5 mũ 2 +5 mũ 3 + ..... + 5 mũ 99
e) ( 2 . x - 1 ) mũ 4 = 625