A = 1 + 1 x 2 + 1 x 2 x 3 + 1 x 2 x 3 x 4 + 1 x 2 x 3 x 4 x 5 + ........... + 1 x 2 x 3 x ....... x 100 .
ai giúp zới
tìm x thuộc Z
1/ x.(x+7)=0
2/ (x+12). (x-3)=0
3/ (-x +5).(3-x)=0
4/x.(2+x).(7-x)=0
5/(x-1).(x+2).(-x-3)=0
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 biết
a) x +(x + 1) + (x + 2) + .... + (x +30) = 620
b) 2+4+6+8+....+2x = 210
c) (x-1) +(x-2)+(x-3)+...+(x-20) = -610
d) (x-3)(2x-7) = 0
e) |3-x| = x-5
g) |5x-2| \(^{_{ }\le}\)13
h) x+|2-x|=6
t) \(3^x+3^{x+1}+3^{x+2}=1053\)
i) | x+1| +|x-2| = 3
Nhanh lên! Mình cần gấp. Nguyễn Huy Tú
2x-13=17+x
17-{x-(-x-(-x))}=-16
x-{(-x+(x+3))-((x=3)-(x-2))}
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 thuộc Z
|x-3|=7 (với x<3)
(x+1).(x-6)=0
3.x+2 chia hết x-1
Tìm x ϵ Z biết:
a) 17 - {-x + [-x - (-x)]} = -16
b) x-{[-x + (x+3)]} - [(x+3) - (x-2)] = 0
rút gọn biểu thức sau:
25^3 x 3^5 x a^4 x b^3 x (3^7 x 3a x b^6)
Hết ! gấp nha !
x + (x+1) + (x+2) + (x+3) +.........+ (x+30)
1+3+5+7+...+ (2n+1) = 225
(x+3) + (x+4) + (x+5 ) + ..............+ (x+22) = 450
GIÚP MÌNH NHA MẤY BẠN
THANK YOU