22.88/5.2+4.8×6.5
=4.4+4.8×6.5
=4.4+31.2
=35.6
52.8-6×1.43
=52.8-8.58
=44.22
17.4-19.8/4.5×[0.5+0.25]
=17.4-4.4×0.75
=17.4-3.3
=14.1