Gia tri cua x thoa man 2x+2/3x-6=2x-6/3x-15
gia tri cua x thoa man 2x+2/3x-6 = 2x-6/3x-15
Áp dụng tính chất của dãy tỉ số bằng nhau ta có:
\(\frac{2x+2}{3x-6}=\frac{2x-6}{3x-15}=\frac{\left(2x+2\right)-\left(2x-6\right)}{\left(3x-6\right)-\left(3x-15\right)}=\frac{2x+2-2x+6}{3x-6-3x+15}=\frac{8}{9}\)
=> (2x + 2).9 = (3x - 6).8
=> 18x + 18 = 24x - 48
=> 18 + 48 = 24x - 18x
=> 6x = 66
=> x = 66 : 6 = 11
a) tim gia tri nho nhat cua bieu thuc
A= | 2x-2 | + | 2x-2019 |
b) tim x lon nhat thoa man
| 2x-4 | - | 6-3x | = -1
a ) \(A=\left|2x-2\right|+\left|2x-2019\right|\ge\left|2-2x+2x-2019\right|=\left|2-2019\right|=2017\)
Để A đạt GTNN là 2017 <=> \(\left(2-2x\right)\left(2x-2019\right)\ge0\Rightarrow1\le x\le\frac{2019}{2}\)
b ) \(\left|2x-4\right|-\left|6-3x\right|=-1\)
\(\Leftrightarrow2\left|x-2\right|-3\left|x-2\right|=-1\)
\(\Leftrightarrow-\left|x-2\right|=-1\)
\(\Rightarrow\left|x-2\right|=1\)
\(\Rightarrow x=1;3\)
Mà x lớn nhất => x = 3
cho ham so y=2x^2-3x+1. gia tri lon nhat cua x thoa man f(-x)=f(2x) la x=?
gia tri lon nhat thoa man 3x-7=6-2x
1. so x>0 thoa man \(\frac{5}{x}=\frac{x+1}{22}\)
2. GTLN cua x thoa man \(5^{\left(x-2\right)\left(x+3\right)}\)
3. Gia tri x<0 thoa man /\(x^2+50\)/=/\(-2x^2\)-1/
4. Gia tri nguyen cua x thoa man \(\left(3x-4\right)^5\)=\(^{\left(3x-4\right)^7}\)la x=
5. So gia tri cua x thoa man /x-2014/+/x-2015/=0
6. Gia tri cua x de bieu thuc A=\(\frac{x-3+5}{3-x+2}\)dat gia tri lon nhat la x=
so gia tri cua x thoa man |x-1|+|2x-6|=12
giá tri cua x thoa man (x^2-2x)[3x-7]=0
=>x^2-2x=0=>x^2=2x=>x=2
Hoặc 3x-7=0=>x=7/3( loại)
Vậy x=2
1.gia tri x<0 thoa man (2x-3)2=(x+5)2
2.tap hop cac gia tri cua x thoa man x4-2x3+10x2-20x=0 la S(....)
3.phan tich da thuc xy-12+3x-4 ta duoc (x+a)(y+b) khi do a+b=?
giup to 3 bai nay
1. gia tri x lon nhat thoa man : x2(5x-20)=15x
2 gia tri x >0 de -3x4+12x2+1 dat gia tri lon nhat
3. tap hop cac gia tri cua x thoa man : x4+x3+2x-4=0