14．求未知数χ．
| 8χ-7×2.3=32.9 | 5：χ=$\frac{3}{4}$：$\frac{1}{6}$ | χ-0.25=$\frac{1}{4}$ |
| $\frac{0.7}{X}$=$\frac{14}{5}$ | 8：30=24：X | 2X-$\frac{1}{2}$=0.5 |
13．怎样简便就怎样算．
| 8.35×0.6+1.65×0.6 | 3.45×101 | $\frac{5}{6}$÷$\frac{1}{4}$×$\frac{3}{5}$ |
| 7.2÷1.25÷8 | （1-0.8×$\frac{3}{4}$）÷$\frac{4}{5}$ | 8-$\frac{2}{3}$÷$\frac{1}{4}$ |
12．直接写得数．
| 87+48= | 0.47+3.8= | 5-1.37= | 0÷130= | $\frac{3}{5}×\frac{7}{9}$= | 9-0.9= |
| 5÷25%= | $\frac{2}{5}$÷$\frac{8}{5}$= | $\frac{1}{4}$+0.27= | 1×3.5= | ɑ×0= | 3.2×6= |
| 2×6= | 3÷0.5= | $\frac{1}{4}+\frac{3}{8}$= | 1-23%= | 0.5-$\frac{1}{5}$= | 0.37+5= |
11．小新的身高和体重．（ ）
0 156328 156336 156342 156346 156352 156354 156358 156364 156366 156372 156378 156382 156384 156388 156394 156396 156402 156406 156408 156412 156414 156418 156420 156422 156423 156424 156426 156427 156428 156430 156432 156436 156438 156442 156444 156448 156454 156456 156462 156466 156468 156472 156478 156484 156486 156492 156496 156498 156504 156508 156514 156522 199269
| A． | 成正比例 | B． | 反比例 | C． | 不成比例 |