Question

1.  Rút gọn phân số :

12/18 ; 22/33 ; 1010/1313 ; 27/36 ; 202/303 ; 1111/1212 .

2.   Tính bằng cách thuận tiện nhất :

a) 12x1313/13x1212        ;            b) 1111x121212/ 1212x111111

Answer 1

1. \(\frac{12}{18}\)= \(\frac{2}{3}\)

    \(\frac{22}{33}\)= \(\frac{2}{3}\)

    \(\frac{1010}{1313}\)= \(\frac{10}{13}\)

    \(\frac{27}{36}\)= \(\frac{3}{4}\)

    \(\frac{202}{303}\)= \(\frac{2}{3}\)

    \(\frac{1111}{1212}\)= \(\frac{11}{12}\)

2. a) 12 x \(\frac{1313}{13}\)x  1212

       = 12 x \(\frac{13}{13}\)x 1212

Answer 2

1.    \(\frac{12}{18}=\frac{2}{3}\):   \(\frac{22}{33}=\frac{2}{3}\);  \(\frac{1010}{1313}=\frac{10}{13}\);  \(\frac{27}{36}=\frac{3}{4}\)  ; \(\frac{202}{303}=\frac{2}{3}\);\(\frac{1111}{1212}=\frac{11}{12}\)

2 a)\(\frac{12X1313}{13X1212}=\frac{12X13X101}{13X12X101}=1\);b)   \(\frac{1111X121212}{1212X111111}=\frac{11X101X12X10101}{12X101X11X10101}=1\)

Answer 3

22/33