a. 3^x=1-x^2
x=0 la nghiem
x>=1; VT>=3 VP<=0 vo nghiem
b. (de bai thieu n khac 0 vi neu n=0 dung voi moi x)
3x-14=1=> x=5
c.(5^2x5^x+1)=5^4
5^x+1=5^2=> x=1
a) x+ 3/4 =1
b) 1/2. x + 5 = -1
c) 3/4 : (2/3.x +-1/5)=6
d) -5/6 . 120/25<x<-7/15 . 9/14 với x thuộc z
tìm STN x biết:
a)19992x-6=1
b)(3x-14)n=1
c)52x.55x=625
d)3x+3x+1+3x+2=243.39
e)(x+83)+(x+82)+.....+x=4070
i)(x+1)+(x+2)+......+(x+10)=5750
giup mik voi tim x biet
1, 5-(3x+6)>-2x+1
2, -7.(x+2)-3x<6-11x
3, (x+1).(x+2)-x.(x+3)<4-x
4, 6-2x>17+(4-x)
a) x + 7 ⋮ x + 2
b) 2x + 5 ⋮ x + 1
c) 3x - 2 ⋮ x + 3
d) 12x + 1 ⋮ 3x + 2
e) x2 + 3x + 5 ⋮ x + 3
f) X2 - 2x + 3 ⋮ x + 2
Tim x, biet:
1) -5.(2-x)+4.(x-3)=10.x-15
2) 2.(7x-14)-7.(3x-5)=28
3) 17+x=7+6.x
4) 4.!x-2!=8
5) 4.x-5.(-3+x)=7
mik dag gap lam tra loi nhanh va chi tiet giup mik
Tìm số nguyên x để các phân số sau là phân số nguyên
a) -3/ x - 1
b) -4/2x - 1
c) 13/5 - x
d) 3x + 7/x - 1
e) 4x - 1/3 - x
Làm ơn hãy giúp mình
A)4X(X-5)+X(X-1)
B)3X(6X-1)-X(X-6)
C)X(X-5)-X(X+3)-6(X+8)
D)Xmu2(X-2)-X(Xmu2-6)
giup minh voi=(
a) x+x+2.x=76:2
b)2.x=x+14
c)2.x-3/5=3/4
d)3/5-2.x=1/4
júp mik voi mik dang gap.Thanks truoc
Tìm x
a) 1800 : [(3^6-14)+30] = 72 va` x E Z
b) 11 - (x-6) = 9
c) 2x + 1 E U(x+5) va` x E N
giup minh` voi