\(A=\left|x+3\right|+\dfrac{5}{2}\ge\dfrac{5}{2}\forall x\)
Dấu '=' xảy ra khi x=-3
\(B=\left|2x+1\right|-\dfrac{1}{4}\ge-\dfrac{1}{4}\forall x\)
Dấu '=' xảy ra khi x=-1/2
Bài 14 : Tìm x biết :
a) x: \(4\frac{1}{3}=-2,5\) b) x: \(\frac{-3}{5}=\frac{-10}{21}\) c) \(\frac{2}{3}x-\frac{1}{2}=\frac{1}{10}\) d) \(\frac{1}{2}x+\frac{1}{2}=\frac{5}{2}\)
Tìm GTNN
B = - (\(\frac{3}{4}\) - \(\frac{1}{2}\) . /x + \(\frac{1}{3}\) )
BT 1 TÌM X
A, \(\frac{3}{4}x+1=2\)
b, \(\frac{2}{3}+\frac{1}{3}:x=-1\)
c , |2x-1|=5
tìm x , y , z biết
a) / x - 1/2 / - 2x = 1
b ) / x - 1/3 / + / 2y - 1 / = 0
c ) / x - 1,5 / + / y - 2,5 / + / x + y + z / < hoặc = 0
tìm x , y , z biết
a) / x - 1/2 / - 2x = 1
b ) / x - 1/3 / + / 2y - 1 / = 0
c ) / x - 1,5 / + / y - 2,5 / + / x + y + z / < hoặc = 0
tìm x biết :
a) \(\left(x+\frac{1}{2}\right).\left(\frac{2}{3}-2x\right)=0\)
b) \(\left(x.6\frac{2}{7}+\frac{3}{7}\right).2\frac{1}{5}-\frac{3}{7}=-2\)
c) \(x.3\frac{1}{4}+\left(-\frac{7}{6}\right).x-1\frac{2}{3}=\frac{5}{12}\)
d) \(5\frac{8}{17}:x+\left(-\frac{4}{17}\right):x+3\frac{1}{7}:17\frac{1}{3}=\frac{4}{11}\)
e) \(\frac{17}{2}-\left|2x-\frac{3}{4}\right|=-\frac{7}{4}\)
Tìm x,y Biết :
a, | 2x | - | - 2,5 | = | -7,5|
b, | 3x | . | -3,5 | = | -2,8 |
c, ( 3x - 5 ) . ( \(\frac{3}{2}\)x + 2 ) . ( 0,5x - 10 ) = 0
Tìm GTNN của
A=5+3(2x-1))2
B=8-x2/2-x2
C=27-2x/12-x
F= 31-5x/10-x
Tìm GTNN A=2x^2+(y+1)^4+1
