(55/57- 51/95) :129/133= 854/1935.
1)) 55/57- 51/95=
(55•10)/(57•10)- (51•6)/(95•6)=
550/570 - 306/570= 244/570= 122/285;
{сократили 244/570 на 2}
2)) 122/285 : 129/133=
122/285• 133/129=
{сокращаем 285 и 133 на 19}
122/15• 7/129= (122•7)/(15•129)=
854/1935.