10．把一个棱长为4分米的正方体分成两个完全一样的长方体后，每个小长方体的体积是（ ）立方厘米．
| A． | 64 | B． | 32 | C． | 16 |
6．口算
0 138286 138294 138300 138304 138310 138312 138316 138322 138324 138330 138336 138340 138342 138346 138352 138354 138360 138364 138366 138370 138372 138376 138378 138380 138381 138382 138384 138385 138386 138388 138390 138394 138396 138400 138402 138406 138412 138414 138420 138424 138426 138430 138436 138442 138444 138450 138454 138456 138462 138466 138472 138480 199269
| 6×$\frac{5}{9}$= | $\frac{5}{6}$×$\frac{3}{8}$= | 9×$\frac{5}{54}$= | $\frac{8}{25}$×$\frac{5}{4}$= |
| $\frac{2}{3}$-$\frac{5}{9}$= | $\frac{11}{13}$×$\frac{26}{33}$= | $\frac{1}{14}$×140= | $\frac{8}{25}$+$\frac{2}{5}$= |
| $\frac{3}{8}$×100= | $\frac{1}{3}$×0= | $\frac{2}{13}$×6= | $\frac{1}{2}$+$\frac{1}{3}$= |