13.65+32.47+17.52=
78.14﹣31.43﹣18.57=
143﹣15.28﹣84.72=
53.27﹣8.4﹣3.27﹣1.6=
(13.1﹣9.28)﹣(4.5﹣2.74)=
56.65﹣(13.22+16.65)=