21.6﹣3.75=
5.03+12.8=
820÷(2×2) 42×9÷6 (305-274)×13
960÷16×3
32×(12+65÷13)
60-[(1200-200)÷20]
450×28=
136×27=
603×14=
840×50=
A.(1,1)
B.(3,1)
C.(3,2)