4.02＋5.4＋0.98 5.17－1.8－3.2 =5.17-（1.8+3.2）=5.17-5=0.1713.75－(3.75＋6.48)=13.75-3.75-6.48=3.523.68＋7.56－2.68 7.85＋2.34－0.85＋4.66 35.6－1.8－15.6－7.23.82＋2.9＋0.18＋9.1 9.6＋4.8－3.6 7.14...