用简便方法计算:
23×10.2 43×10.5 26×10.7
34×9.2 21×9.9 56×9.6
35×19.2 +35 ×20.8 64
3.5×19 +3.5 0.64
26×19.8- 26 ×9.8 58
8.9×21- 8.9 23.5
25 ×9.8 × 0.4 1
×56.5+64 ×43.5 ×99+0.64 ×66.5-58 ×16.5 ×101-23.5 25 ×9.2 × 0.8 1
0.025 ×32 × 1.25 125 × 0.56
25 ×1.2 12.5 × 32 2.5 × 28
27-3.7-17.3 56.8-32.5-18.5 28.9-12.3-8.9
54.6-23.7-14.6 78.1-23.9+14.9 123.5-57.8+14.3
0.25 ×0.7× 4
1.25 ×1.3× 0.8 1
28×10.4 45
2.5 ×0.9× 2 2.7 ×0.4× 50 ×10.8 773.25 ×0.5× 6
2.25 ×0.12×6
×9.5 2