320÷5= △906÷3=
37×65= △78×46=
方法一:
方法二:
803-207= ÷5= 798+150= + =
0.25×8= 1.5- = 7.5÷ = 0.77+0.3=
9.8-8= × = 45.54÷45= 24× =