①2.5×44
② ×-÷
③8.2-3.2÷0.4+0.6
铺设一条20千米的电缆,.已经铺了多少千米?
算式:
18× 18 ×24 ×0
×1 100× 100 ×1
① × ×
② × ×
③36× + ×63+
④ ×(180×26)×
⑤ + × -
⑥ × × ×18
0-9 9.789.89
dm3750cm3