2019﹣128= 10﹣0.86= 20×0.8= 100÷20%=
10÷0.5= ﹣0.375= ×0.81= 52﹣32=
0.125×5×0.8= 13÷91= 3.14×8= 4.5﹣4.5÷15=
6﹣2 = = ÷32%= ×8÷ ×8=