3/8*8/13*13/18 и 4/11*22/39*13/16 помогите плиз

3/8*8/13*13/18 =3/18=1/6

4/11*22/39*13/16 = (4*22*13)/(11*39*16)=
(1*2*1)/(1*3*4)=2/12=1/6

[tex]\displaystyle a).. \frac{3}{8}* \frac{8}{13}* \frac{13}{18}= \frac{3*8*13}{8*13*18}= \frac{3}{18}= \frac{1}{6} \\ \\ \\ b).. \frac{4}{11}* \frac{22}{39}* \frac{13}{16}= \frac{4*22*13}{11*39*16}= \frac{1*2*1}{1*3*4}= \frac{1}{6} [/tex]