4.2×0.8= 2.7×0.11= ☆2.9×0.56=
2.06×4.8= 8.5×0.208= 6.23×4.2≈(精确到百分位)
3.58×0.22 (精确到百分位)
3.5×0.506 (保留一位小数)
16.5×38
0.12×0.45= 0.085×0.16=