17．直接写出得数．
| 0.42÷1%= | 0.32= | 5400÷90= | 100-2.02= | 0.12÷0.3= |
| 0.1×0.99= | $\frac{7}{8}$×$\frac{4}{7}$= | $\frac{8}{3}$÷4= | 0.75+$\frac{1}{4}$= | 4×25%= |
11．口算．
| 238+99= | 1-0.99= | 4.13-1.3= | 0.57+0.43= |
| 3-1$\frac{5}{6}$= | 7.125+1$\frac{7}{8}$= | 1÷$\frac{5}{8}$= | 0×2$\frac{4}{9}$= |
| 3$\frac{2}{15}$×4= | 25×28= | 7.2÷0.6= | 4$\frac{1}{4}$÷1= |
10．20、12和30的最小公倍数是（ ）
0 156213 156221 156227 156231 156237 156239 156243 156249 156251 156257 156263 156267 156269 156273 156279 156281 156287 156291 156293 156297 156299 156303 156305 156307 156308 156309 156311 156312 156313 156315 156317 156321 156323 156327 156329 156333 156339 156341 156347 156351 156353 156357 156363 156369 156371 156377 156381 156383 156389 156393 156399 156407 199269
| A． | 2 | B． | 20 | C． | 60 |