x . 2/7 = 6/11
x = 6/11 : 2/7
x = 21/11
Ai k mik mik k lại
X x 2/7 = 6/11
X = 6/11 : 2/7
X = 21/11
Xx2/3+Xx73=11/4
Xx 3/5+Xx2/7=31/70
Xx2+Xx1/6=8/5
giúp mình bài nay nha
Tìm x
Xx7/x =7
b)Xx2/5=4/7:3/2
Tìm X
\(\frac{1}{2+4}\)+\(\frac{1}{2+4+6}\)+\(\frac{1}{2+4+6+8}\)+.........+\(\frac{1}{2+4+6+8+......+Xx2}\)
(6:3/5-7/6+6/7):(21/5*10/11+57/11)=?
Xx3,5-Xx2=30
a,\(\dfrac{1}{7}\text{x}\dfrac{2}{7}+\dfrac{1}{7}\text{x}\dfrac{5}{7}+\dfrac{6}{7}\) b,\(\dfrac{6}{11}\text{x}\dfrac{4}{9}+\dfrac{6}{11}\text{x}\dfrac{7}{9}-\dfrac{6}{11}\text{x}\dfrac{2}{9}\)
c, \(\dfrac{4}{25}\text{x}\dfrac{5}{8}\text{x}\dfrac{25}{4}\text{x}24\)
a 5/6+7/9:5/6-1/6
b 8/11*7/8+8/11:4/5
