Ответ:\(0.7\cdot1.3+5.1:0.17=0.91+30=30.91\).\(3.38-2.24:1.25=3.38-1.792=1.588\).\((3.38-2.24):1.25=1.14:1.25=0.912\).\(31.7:63.4-23.4:11.7=0.5-2=-1.5\).Ответ: 1) 30,91; 2) 1,588; 3) 0,912; 4) −1,5.