12．直接写出得数．
0 156447 156455 156461 156465 156471 156473 156477 156483 156485 156491 156497 156501 156503 156507 156513 156515 156521 156525 156527 156531 156533 156537 156539 156541 156542 156543 156545 156546 156547 156549 156551 156555 156557 156561 156563 156567 156573 156575 156581 156585 156587 156591 156597 156603 156605 156611 156615 156617 156623 156627 156633 156641 199269
| 4.2÷0.07= | 5.2×6.8≈ | 1-34%= | 36-26÷2= | 7.2÷2.5÷4= |
| $\frac{9}{10}$÷$\frac{1}{3}$= | $\frac{5}{6}$-$\frac{3}{8}$= | 6.6+0.44= | $\frac{2}{5}$×$\frac{1}{2}$÷$\frac{2}{5}$×$\frac{1}{2}$= | 10-3.045= |