16．解方程
| $\frac{0.7}{x}$=$\frac{14}{5}$ | 2x+3×0.9=24.9 | 120%x+x=44 |
| $\frac{40}{24}$=$\frac{5}{x}$ | 6.5：x=3.25：4 | $\frac{2}{3}$：$\frac{5}{6}$=x：9 |
15．直接写得数
0 156391 156399 156405 156409 156415 156417 156421 156427 156429 156435 156441 156445 156447 156451 156457 156459 156465 156469 156471 156475 156477 156481 156483 156485 156486 156487 156489 156490 156491 156493 156495 156499 156501 156505 156507 156511 156517 156519 156525 156529 156531 156535 156541 156547 156549 156555 156559 156561 156567 156571 156577 156585 199269
| 1-$\frac{2}{5}$+$\frac{3}{5}$= | 1÷$\frac{3}{2}$×$\frac{2}{3}$= | 0.5-$\frac{1}{5}$+0.5-$\frac{1}{5}$= |
| 8.1+$\frac{1}{4}$= | $\frac{1}{4}$×24= | 7÷$\frac{3}{4}$= |
| 9-0.9= | 72÷0.4= | 1.25×8= |