Răspuns:
Explicație pas cu pas:
1 3/25*2 1/7-2 1/9*27/95=28/25*15/7-19/9*27/95=4/5*3/1-57/95=12/5-57/95=228/57/95=171/95
4 7/12*1 3/11+ 1 1/15*1 11/64= 55/12*14/11+2/1*5/8=5/6*7/1+2/1*5/8=35/6+10/8=280/48+60/48=340/48=85/12
