115+132+118+85 487﹣187﹣139﹣61
5.17﹣0.83﹣0.27
5.17﹣0.83+0.17
28.06+1.94+2.06
5.6﹣0.18﹣1.92.
24.65﹣(4.65+3.28+2.72)=
29.4+37.8+60.6=
①146+451+54=
②932﹣27﹣73=
③767+299=
④482﹣203=
168﹣52﹣48= 37+125+63+175=