\(\frac{2x-1}{x+5}>2\Leftrightarrow\frac{2x-1}{x+5}>\frac{2\left(x+5\right)}{x+5}\)
\(\Leftrightarrow\frac{2x-1}{x+5}>\frac{2x+10}{x+5}\)
\(\Leftrightarrow2x-1>2x+10\)
\(\Leftrightarrow0x>11\)(vô lý)
Vậy phương trình vô nghiệm
\(\frac{2x-1}{x+5}>2\Leftrightarrow\frac{2x-1}{x+5}>\frac{2\left(x+5\right)}{x+5}\)
\(\Leftrightarrow\frac{2x-1}{x+5}>\frac{2x+10}{x+5}\)
\(\Leftrightarrow2x-1>2x+10\)
\(\Leftrightarrow0x>11\)(vô lý)
Vậy phương trình vô nghiệm
Cho bieu thuc A = ( 1/ x^2 - x + 1/x-1):x+1/x^2 -2x +1 ( x khac 0;1;-1)
a) Rut gon bieu thuc A
b) Tinh gia tri bieu thuc A khi x=2014/2013
c)Tim dieu kien cua x de A co gia tri lon hon 1
cho 2 bieu thuc A=x+x^2/2-x va B=2x/x+1+3/x-2-2x^2+1/x^2-x-2 a, tinh gia tri cua A khi /2x-3/=1 b,tim dieu kien xac dinh va rut gon bieu thuc B c,tim so nguyen x de P=A.B dat gia tri lon nhat
mk dang can gap
Tim x sao cho gia tri bieu thuc 2-5x nho hon gia tri bieu thuc 3(2-x)
1) Cho bieu thuc A=\(3+\frac{2}{x-1}\). Tinh gia tri cua bieu thuc A khi |2x-3|=1
2) Rut gon bieu thuc B=\(\frac{x}{x-1}\)-\(\frac{x-5}{x+1}\)-\(\frac{3-x}{1-x^2}\)
3) Tim cac gia tri nguyen cua x de bieu thuc \(\frac{B}{A}\)co gia tri nguyen duong
gia tri lon nhat cua bieu thuc: A= -2x2 + x - 5
tim gia tri lon nhat cua bieu thuc A=3-4x/x2+1
Tim gia tri lon nhat cua bieu thuc p=-x^2+13x+2012
tim gia' tri. lon' nhat' cua? bieu thuc
F=-x^2-4x+20
1.gia tri lon nhat cua bieu thuc 7x-2x2
2.gia tri x>1 thoa man (9x-7)2=(5-2x)2
3.gia tri nho nhat cua x4+x2-5.42