A、12cm2
B、21cm2
C、24cm2
D、10.5cm2
3.6+5.4= 99×0.3+0.3= 0.008×1000= ÷ =
70÷0.01= 2.8×0.5= 25÷ = × =
①87+5.6﹣0.87+4.4
②3.68﹣0.82﹣0.18
③5× +5.5×80%+0.8
④ ×36
⑤ ×3÷ ×3