\(a,\)
\(4.\left|x-5\right|-54=-34\)
\(4.\left|x-5\right|\) \(=-34+\left(-54\right)\)
\(4.\left|x-5\right|\) \(=-88\)
\(\left|x-5\right|\) \(=-88\div4\)
\(\left|x-5\right|\) \(=-22\)
\(\Rightarrow\orbr{\begin{cases}x-5=22\\x-5=-22\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=22+5\\x=-22+5\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=27\\x=-17\end{cases}}\)
tim x biet : (2x-1)+(4x-1)+...+(400x-200)=5+10+...+100
Tìm x, biết:
a, 70 - 5 ( x - 3 ) = 45
b, 10 + 2 x = 4 5 : 4 3
c, 60 - 3 x - 2 = 51
d, 4 x - 20 = 2 5 : 2 3
x -56 : 4= 16
101 +(36 –4x) =105
2(x-51) = 2.23+ 20
10 -(x –3): 2 = 72–110
2x –49 = 5.32
[(8x -12) : 4].33= 36
52x –3–2 . 52= 52. 3
(x3–7) : 4 = 5
Bài 1:
a, x+7/45=x-3/15
b,4x+1/x-2 thuộc Z
c,(-2014). (x+3)<0
d,x-3/x^2+1
g,4x-(3+5x)=14
h,x+1/x-3 tối giản(x thuộc Z)
i,x+4/2x-1 là số nguyên tố (x thuộc Z)
k,(x+3).(y-2)= -|0|
Bài 2: So sánh:
a, 10^17+1/10^18+1 và 10^18+1/10^19+1
b,1/50+1/51+....+1/99 và 1/2
c,1/10+1/11+...+1/100 và 1
d,10^7+5/10^7-8 và 10^8+6/10^8-7
tim x :
a) 3 x x -5 + 27 = 54
b) x - 5^2 = - 4
c) x + 3^3 = 2^3
d) | x - 7 | + 9 = - 3
e ) | 5 - x | - 7 = - 3
g ) 4^x : 2 = 32
h ) 5^x - 2- 5 = 25
k ) x^10 = x^8 giuppp mikk
1. Tim \(x\in Z\)de \(A\in Z\)
A= \(\frac{x+5}{x+3}\)
2. Tim GTLN hoac GTNN cua bieu thuc:
A= -7+/2-x/
B= 5- /2x+3/
3. Tim \(x\in Z\)
a) \(7⋮x+3\)
b) \(x+4⋮x+1\)
c) \(4x+3⋮x+2\)
d) \(\left(x+1\right)+\left(x+2\right)+...+\left(x+9\right)+\left(x+10\right)=5\)
e) \(\left(x-10\right)+\left(x-9\right)+...+\left(x-1\right)=-2015\)
i) (-4)3 + /x/=2010
k) /x+5/ \(\le2\)
l) /x+3/ = x-1
4. Chung minh rang:
\(A=1-3+3^2-3^2+...+3^{98}-3^{99}⋮4\)
(giai ho mk nhe! thu 2 phai nop roi! ban nao giai duoc nho giai nhanh gium mk nhe, mk mang on suot doi luon!)
1 )Tim x, y thuoc Z
x + y = x.y
2) Tim x thuoc Z
(x + 1)+(x+3)+(x+5)+...+(x+99)=0(x-3)+(x-2)+(x-1)+...+10+11=11-12(x-5)+7(3-x)=530(x+2)-6(x-5)-24x=100Tìm x \(\varepsilon\)Z biết :
a, x - 43 = ( 35 - x ) - 48
b, 305 - x + 14 = 48 + ( x - 23 )
c, ( x - 6 + 85 ) = ( x + 51 ) - 54
d, -( 35 - x ) - ( 37 - x ) = 33 - x
e, - 12. ( x - 5 ) + 7 . ( 3 - x ) = 5
f, 30. ( x+ 2 ) - 6 . ( x - 5 ) - 24 = 100
7 [ x + 5 ] - 20 = 190 155 - 10 [ x + 1 ]= 55
6 [ x + 2 mũ 3 ] + 40 = 100 15x - 133 = 17
90 [ x + 2 ] = 45 14x + 54= 82
17x - 20 =14
