6 . x + x = 734 : 731
cac ban giup minh, can gap
24 : ( 6 - x ) = 8
25 . 5 x + 2 = 56
cac ban giup minh, minh can gap
24:(6-x)=8
6-x=24:8
6-x=3
x=6-3
x=3
#Châu's ngốc
a) \(24:\left(6-x\right)=8\)
\(6-x=24:8=3\)
\(x=6-3=3\)
Vậy x = 3
b) \(25\cdot5^{x+2}=5^6\)
\(5^2\cdot5^{x+2}=5^6\)
\(5^{x+2}=5^6:5^2=5^{6-2}=5^4\)
\(\Leftrightarrow x+2=4\)
\(x=4-2=2\)
Vậy x = 2
Bài làm
a) 24 : ( 6 -x ) = 8
6 - x = 3
x = 6 - 3
x = 3
Vậy x = 3
b) 25 . 5x + 2 = 56
=> 52 . 5x + 2 = 56
=> 2 + x + 2 = 6
=> x + 4 = 6
=> x = 2
Vậy x = 2
# Học tốt #
( x - 4 ) . ( 6 - x ) = 0
( 2 . x - 1 )2 = 25
( x : 6 )5 = 243
cac ban giup minh, minh can gap !!!!
+ ) \(\left(x-4\right)\left(6-x\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-4=0\\6-x=0\end{cases}\Rightarrow}\orbr{\begin{cases}x=4\\x=6\end{cases}}\)
+ ) \(\left(2x-1\right)^2=25\)
\(\left(2x-1\right)^2=5^2\)Hoặc \(\left(2x-1\right)^2=\left(-5\right)^2\)
\(\Rightarrow\orbr{\begin{cases}2x-1=5\\2x-1=-5\end{cases}\Rightarrow\orbr{\begin{cases}2x=6\\2x=-4\end{cases}\Rightarrow}\orbr{\begin{cases}x=3\\x=-2\end{cases}}}\)
+ ) \(\left(x\div6\right)^5=243\)
\(\left(x\div6\right)^5=3^5\)
\(\Rightarrow x\div6=3\)
\(\Leftrightarrow x=18\)
\(\left(x-4\right)\left(6-x\right)=0\)
Th1:\(x-4=0\Rightarrow x=4\)
Th2: \(6-x=0\Rightarrow x=6\)
\(\Rightarrow S=\left\{4;6\right\}\)
\(\left(2x-1\right)^2=25\)
\(\left(2x-1\right)^2=5^2\)
\(2x-1=5\)
\(2x=6\)
\(x=3\)
\(\Rightarrow S=\left\{3\right\}\)
\(\left(\frac{x}{6}\right)^5=243\)
\(\left(\frac{x}{6}\right)^5=3^5\)
\(\frac{x}{6}=3\)
\(x=3\cdot6=18\)
\(\Rightarrow S=\left\{18\right\}\)
( 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!!!
bài 1: tìm tất cả các cặp số nguyên (x,y) thoả mãn phương trình:
x^2-25=y.(y+6)
cac ban oi giup minh. minh dàng can gap
x/27=-2/3,6 cac ban oi hay giup minh gium nhe minh dang can gap
=> x . 3,6=27 . -2
=>x . 3,6=-54
=>x=-15
Tìm số nguyên x biết:
a) -2.(x+6)+6.(x-10)=8
b) -4.92x+9)-(-8x+3)-(x+13)=0
c) 7x.(2+x)-7x.(x+3)=14
Minh dang can gap ban nao co the giup minh duoc khong??
a)\(-2\left(x+6\right)+6\left(x-10\right)=8.\)
\(\Leftrightarrow-2x-12+6x-60=8\)
\(\Leftrightarrow4x=80\)
\(\Rightarrow x=20\)
b/ \(-4\left(2x+9\right)-\left(-8x+3\right)-\left(x+13\right)=0\)
\(\Leftrightarrow-8x-36+8x-3-x-13=0\)
\(\Leftrightarrow-x=52\)
\(\Rightarrow x=-52\)
c/\(7x\left(2+x\right)-7x\left(x+3\right)=14\)
\(\Leftrightarrow14x+7x^2-7x^2-21x=14\)
\(\Leftrightarrow-7x=14\)
\(\Rightarrow x=-2\)
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 gia tri nho nhat cua:
F = |x| + |x + 2|
cac ban giup minh voi nhe minh dang can gap lam
\(F=\left|x\right|+\left|x+2\right|=\left|-x\right|+\left|x+2\right|\ge\left|-x+x+2\right|=2\)(Áp dụng bất đẳng thức \(\left|a\right|+\left|b\right|\ge\left|a+b\right|\))Dấu "=" xảy ra \(\Leftrightarrow-x\left(x+2\right)\ge0\)
\(\Leftrightarrow\orbr{\begin{cases}\hept{\begin{cases}-x\ge0\\x+2\ge0\end{cases}}\\\hept{\begin{cases}-x\le0\\x+2\le0\end{cases}}\end{cases}}\Leftrightarrow\orbr{\begin{cases}\hept{\begin{cases}x\le0\\x\ge-2\end{cases}\Rightarrow x=0;-1;-2}\\\hept{\begin{cases}x\ge0\\x\le-2\end{cases}\Rightarrow x\in\varnothing}\end{cases}}\)
Vậy x = 0;-1;-2
cái chỗ giải -x(x+2) >=0 bạn tự giải làm 2 trường hợp: (-x>=0 và x+2>=0) hoặc (-x<=0 và x+2<=0)
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 \(3^2=9\)
\(\Rightarrow x=2\)
\(\Rightarrow x\in\left\{2\right\}\)