\(2\left(x-1\right)-5\left(x+2\right)=-10\\ \Rightarrow2x-2-5x-10=-10\\ \Rightarrow-3x=2\\ \Rightarrow x=\dfrac{-2}{3}\)
Vậy \(x=\dfrac{-2}{3}\)
Tìm GTNN của biểu thức C= (x+1)^2 + (y-1/3)^2-10
Tìm GTLN của biểu thức D= 5/(2x-1)^2+3
Giúp em với ạ
Bài 1. Tìm \(x\).
a) -5(\(x\)2-3\(x\)+1)+\(x \)(1+5\(x\))=\(x-2\)
b) \(12x\)2\(-4x\)\((3x+5)\)\(=10x-17\)
c) \(-4x(x-5)+7x(x-4)-3x\)2\(=12\)
Bài 2. Tính ( Rút gọn).
a) \((x+5).(x-7)-7x.(x-3)\)
b) \(x.(x\)2\(-x-2)-(x-5).(x+1)\)
c) \((x-5).(x-7)-.(x+4).(x-3)\)
d) \((x-1).(x-2)-(x+5).(x+2)\)
B1:tìm x biết a, (-2+x^2)(x^2-2)(x^2-2)(x^2-2)(x^2-2)=1 b, (2x+3)(x-4)+(x-5)(x-2)=(3x-5)(x-4) c,(8x-3)(3x+2)-(4x+7)(x+4)=(4x+1)(5x-1) d, 2x^2+3(x-1)(x+1)=5x(x+1) e, (8-5x)(x+2)+4(x-2)(x+1)=(2+x)(2-x) f, 4(x-1)(x+5)-(x+2)(x+5)=3(x-1)(x+2)
Tìm x biết : a ) x+2/5= 1/x-2 b ) x/x+1=x+5/x+7 c )x-1/x+2=x-2/x+3
Bài 1 : Tìm x biết :
a) 5|x-1| + |x-2| = |12-3x|
b) 12x+7 - 3|x-3| = 5|x+1|
Bài 2 : Tìm x biết :
a) |x-3| < 2
b) 2|x-1| - 5(2-x) > 2
c) 4|x-1| - 7|2-4x| < 5
d) 3(2-3x) + |x-3| - 2|1-x| > 3
a 2/3×(x+1)-4/5×(x+2)=35/2 b 4(x-2)+5(x+1)=-15 c 3/2:x+(-5/2)=-7/3
Tìm x, biết
a)\(\dfrac{1}{2}\)x\(x\)-\(\dfrac{7}{3}\)=\(\dfrac{-5}{6}\)+\(\dfrac{3}{4}\)x\(x\)
b)\(\dfrac{4}{5}\)x\(x\)-\(\dfrac{6}{5}\)=\(\dfrac{1}{2}\)+\(\dfrac{3}{2}\)x\(x\)
c)\(\dfrac{2}{5}\)x(3x\(x\)+\(\dfrac{3}{4}\))=\(1\dfrac{1}{5}\)-\(\dfrac{1}{3}\)x\(x\)
d)2x(3x\(x \)+\(\dfrac{3}{4}\))+\(\dfrac{4}{5}\)=\(\dfrac{1}{2}\)-2x\(x\)
TÌM X:
a) 5x-3=2x+1
b) 3.( x-5) - 5.(x+1)= 15
c) x-5/3 - x+2/5 = 1/2
d) 3x-7/2 = 5x-2/3
e) -2.(x-3) + 5.(x-1)= 3+x
f) x.(x-5)- x.(x-2)= 6-x
g) 1/3x-2=1/4x+4
a, (x-1)(x+2)-(x+5)(x-2)
b, (2x-2)(x+4)+(-x+1)(x-2)
c,(-x+5)(x+3)+(2x-1)(x+3)
d, (x+3)(x-1)-(x-7)(x-6)
Giúp tớ với ạaa
