12.直接写出得数.
| 3.2×100= | 0+5.6= | 24×5= | 1.65-0.6= | 725÷100= |
| 0÷72= | 1.3+3.6+2.7= | 100-68= | 38×103≈ | 25×3×4= |
10.用简便方法计算76×99是运用了( )
0 156501 156509 156515 156519 156525 156527 156531 156537 156539 156545 156551 156555 156557 156561 156567 156569 156575 156579 156581 156585 156587 156591 156593 156595 156596 156597 156599 156600 156601 156603 156605 156609 156611 156615 156617 156621 156627 156629 156635 156639 156641 156645 156651 156657 156659 156665 156669 156671 156677 156681 156687 156695 199269
| A. | 乘法结合律 | B. | 加法结合律 | C. | 乘法分配律 |