y x 2 = 20 : 5
y x 2 = 4
y = 4 : 2
y = 2
K chị nha
yx2=20:5
yx2=4
y=4:2
y=2
tck nha cong chua lo lem
y x 2 = 20 : 5
y x 2 = 4
y = 4 : 2
y = 2
y x 2 = 20 : 5
y x 2 = 4
y = 4 : 2
y = 2
K chị nha
yx2=20:5
yx2=4
y=4:2
y=2
tck nha cong chua lo lem
y x 2 = 20 : 5
y x 2 = 4
y = 4 : 2
y = 2
20+28-12^2+x+y=18x,y.tìm x,y
1 x 2 x 3 x 4 x 5 x6 x x7 x 8 x 9 x 10 x 11 x12 x 20 x 20 x182 : 19 -19 x 20 - 500 :7 = ?
D= \(\frac{x^2-2x+2000}{x^2}\)= 1-\(\frac{2x}{x^2}\)+\(\frac{2000}{x^2}\)
Đặt t= \(\frac{1}{2}\)=> D= 2000t2-2t+1 = (\(20\sqrt{5}t\))2-2.\(20\sqrt{5}t\).\(\frac{1}{20\sqrt{5}}\)+\(\left(\frac{1}{20\sqrt{5}}\right)^2\)\(-\left(\frac{1}{20\sqrt{5}}\right)^2\)+1
D= (\(20\sqrt{5}t\)-\(\frac{1}{20\sqrt{5}}\)) 2+\(\frac{1999}{2000}\)\(\ge\)\(\frac{1999}{2000}\)
Min D= \(\frac{1999}{2000}\)khi \(20\sqrt{5}t\)\(-\frac{1}{20\sqrt{5}}\)= 0 => t = \(\frac{1}{2000}\)=> \(\frac{1}{x}\)= \(\frac{1}{2000}\)=> x= 2000
7/2.x-3/4=5/6– -2/3
5/6-(20%.x-3/4)=x+1/2
5x2+14x+9−−−−−√=x2−x−20−−−−−−−−−√+51+x−−−−−√
1=5; 2=10; 3=15; 4=20; 5=x
Hỏi x bằng mấy ai nhanh mà đúng là tk.
x - 3 x 5 = 20
20 + 15 =
x+y=100 x-y=20
tìm x va y biet
a) (x+3) x (y-2) = 2
b) (x+3) x (y-2) = 5