16×+16× 36×()
1÷[] 3.2×
①2-- ②2.5×4÷2.5×4 ③436+785﹣136 ④15÷[(-)×]
①15.3+6.72+5.7+23.28
②×+÷
③0.6×7.1+2.9×
④48×(﹣)
7.28﹣(1.28+0.25) ÷[×(0.5+)]
23× 3.7×+1.3÷