3.6÷3= 1.5×4= 27a÷9a=
0.63÷0.01= 1.4×0.2= 42-32=
9.9×1.19.9 1.337÷0.991.337
①36×()
②1.3×37.5%+2.7×
③ [()]
④13÷()×