56 0.97 0 -0.02 +63%
×+1÷+× (888÷8+3×333)÷[(+)×]
+++ +++++++
①
②7.79÷2.5÷0.8
③12×[×3]
④48.96-3.18-6.82
12﹣3.6= 12×0.5= 36×25%= ×6+=
+= ÷4= 0××5= 28÷1.25÷8=