bài 4:TÌM X x:4/5=1 4/3-x=7/9 x-2/5=7/13 6/11+x=5/2 bài 5TÍNH NHANH 2006x2007x2009x2010/2007x2008x2009x2010 (1-1/4)x(1-1/5)x(1-1/6)x

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1. Bài 4: X:$\frac{4}{5}$=1 X=1x$\frac{4}{5}$ X=$\frac{4}{5}$ $\frac{4}{3}$-x=$\frac{7}{9}$ X=$\frac{4}{3}$- $\frac{7}{9}$X= $\frac{5}{9}$X-$\frac{2}{5}$= $\frac{7}{13}$X= $\frac{7}{13}$+$\frac{2}{5}$X=$\frac{61}{65}$  X$\frac{6}{11}$+x= $\frac{5}{2}$X=$\frac{5}{3}$ -$\frac{6}{11}$ X= $\frac{43}{32}$ 

    

    

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2. Bài 4:
   X:4/5=1
   X=1×4/5
   X=4/5

   4/3-x=7/9
   X= 4/3-7/9
   X= 5/9

   X-2/5=7/13
   X= 7/13+2/5
   X= 61/65

   6/11+x=5/2
   X= 5/2-6/11
   X= 43/22

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