Tim x :
a, 64 . 2x-2 = 22020
b, 21 + 3 . |x| = 3 . ( 42 - 1 )
Mong cac ban giup, minh CAN GAP !!!!!!!!!!!!!!!!!!!!!!!!
Tinh nhanh ( neu co ) :
255 - 21 . 5 . ( 198 : 11 - 8 )
Tim x :
720 : [ 41 - ( 2 . x . 5 ) ] = 2 3 . 5
Mong cac ban giup, minh can gap
255 - 21 . 5 . ( 198 : 11 - 8 )
= 255 - 105 . ( 18 - 8 )
= 255 - 105 . 10
= 255 - 1050
= -795
720 : [ 41 - ( 2 . x . 5 ) ] = 23 . 5
720 : [ 41 - ( 10 . x ) ] = 40
41 - ( 10 . x ) = 720 : 40
41 - ( 10 . x ) = 18
10 . x = 41 - 18
10 . x = 23
x = 23/10
Tinh nhanh ( neu co ) :
255 - 21 . 5 . ( 198 : 11 - 8 )
= 255 - 21 . 5 . ( 18 - 8 )
=255 - 21 . 5 . 10
=255 - 1050
= -795
Thuc hien phep tinh :
-632 + ( -68) + ( -591) + 391
Tim x :
45 - | x+14 | = 23 . 3
Minh can gap, mong cac ban giup !
\(=-700+\left(-200\right)\)
\(=-900\)
Học tốt
\(45-/x+14/=2^3.3\)
\(=>45-/x+14/=24\)
\(TH1:x\ge14=>/x+14/=\left(x+14\right)\)
\(=>45-/x+14/=24\)
\(=>45-\left(x+14\right)=24\)
\(=>x+14=45-24\)
\(=>x=21-14\)
\(=>x=7\)
\(TH2:x< 14=>/x+14/=-\left(x+14\right)=-x-14\)
\(=>45-/x+14/=24\)
\(=>45+x-14=24\)
\(=>45-x=24+14\)
\(=>x=45-38\)
\(=>x=7\)
Vậy...
3 . | 2 . x - 10 | - 2 = 7
mong cac ban giup, minh can gap
3.|2x - 10| - 2 = 7
=> 3.|2x - 10| = 9
=> |2x - 10| = 3
=> \(\orbr{\begin{cases}2x-10=3\\2x-10=-3\end{cases}\Rightarrow\orbr{\begin{cases}2x=13\\2x=-7\end{cases}\Rightarrow}\orbr{\begin{cases}x=6,5\\x=-3,5\end{cases}}}\)
( 2 . x - 5 ) 3 = 8
6 chia het ( x - 1 )
mong cac ban giup, minh can gap truoc 9h
\(\left(2x-5\right)^3=8\)
\(\left(2x-5\right)^3=2^3\)
\(2x-5=2\)
\(2x=7\)
\(x=\frac{7}{2}\)
\(b,6⋮x-1\)
\(\Rightarrow x-1\inƯ6\left(\pm1,\pm2,\pm3\right)\)
+ x-1 =1 => x=2
+ x-1 =-1 =>x=0
+ x-1=2 =>x=3
+ x-1=-2 => x= -1
+ x-1 =3 =>x=4
+ x-1=-3 => x=-2
#Giải :
( 2x - 5 )3 = 8
( 2x - 5 )3 = 23
=> 2x - 5 = 2
2x = 7
x = 7/2
6 chia hết cho ( x - 1 )
=> (x - 1) € Ư (6)
Ư (6) = { 1 ; 2 ; 3 ; 6 }
Nếu x - 1 = 1 => x = 2
Nếu x - 1 = 2 => x = 3
Nếu x - 1 = 3 => x = 4
Nếu x - 1 = 6 => x = 7
[ P/S : € - thuộc ]
#By_Ami
a) (2x-5)3=8
(2x-5)3=23
2x-5 =2
2x =2+5
2x =7
x =7/2
b) \(6⋮\left(x-1\right)\)
\(\Rightarrow x-1\inƯ\left(6\right)\)
\(\Rightarrow x-1\in\left\{-1;-2;-3;-6;1;2;3;6\right\}\)
\(\Rightarrow x\in\left\{0;-1;-2;-5;2;3;4;7\right\}\)
Hok tốt nha!!!
3x+2-5.3x=36
tim x
giup minh vo cac ban minh dang can gap nha
cam on cac ban nhieu
3^x+2-5.3^x=36
3^x(3^2-5)=36
3^x.4=36
3^x=9
x=2
\(3^{x+2}-5\cdot3^x=36\)
\(3^x\cdot3^2-5\cdot3^x=36\)
\(3^x\left(3^2-5\right)=36\)
\(3^x\left(9-5\right)=36\)
\(3^x\cdot4=36\)
\(3^x=36:4\)
\(3^x=9\)có \(3^2=9\)
\(\Rightarrow x=2\)
\(\Rightarrow x\in\left\{2\right\}\)
Tim x
3.x + 17 = 2 mu 8 . 2mu 3
Cac ban oi giup minh voi, minh can gap. ai giup to tick cho nhe
3x+17=28.23
3x+17=211
3x+17=2048
3x=2048-17
3x=2031
x=2031:3
x=677
Vậy x=677
3x + 17 = 28.23
3x + 17 = 28+3
3x + 17 = 211
3x + 17 = 2048
3x = 2048 - 17
3x = 2031
x = 2031 : 3
x = 677
Vậy x = 677
3x + 17 = 28 × 23
<=> 3x+17= 28+3=211 =2048
<=> 3x=2048-17=2031
<=>x=2031:3=677
Vậy x = 677
♡♡♡♡♡♡♡
tim x
1+3+5 +...+x=3200( x la so le )
giup minh voi cac ban
minh dag can gap
100-99+98-97+...+4-3+2-1
Mong cac ban giup minh, minh dang can gap lam
Ta co : 100-99+98-97+...+4-3+2-1
=(100-99)+(98-97)+...+(4-3)+(2-1)
=1+1+...+1+1
Ta lai co: Tu 1->100 co: (100-1)÷1+1=100 so
Co so cap la: 100÷2=50 cap
=1×50
=50
Dãy số trên có SSH là:100 số
Ta ghép 2 số vào 1 nhóm đc 100:2=50(nhóm)
Ta có:(100-99)+(98-97)+...+(4-3)+(2-1)
1+1+1+1+...+1
50.1=50
Nhóm 2 số vào 1 nhóm.Có số nhóm là :
100 : 2 = 50 ( nhóm )
Ta có : 100 - 99 + 98 - 97 + 96 -...+ 4 - 3 + 2 -1
= 1 + 1 + 1 +...+ 1
= 1 .50
= 50.
C=3+(3/1+2)+(3/1+2+3)+(3/1+2+3+4)+...+(3/1+2+3+...+100)
minh dang can gap mong cac ban giup minh T_T