| 56-47= | 10-0.27= | 5-2.5= | 6.3+0.7= | 6÷0.5= |
| 8.4÷4.2= | 2.5×4= |  = |  = |  = |
 = | 9÷10= |  = |  = |  = |
 = |  = |  = |  = |  = |
 = |  = |  = |  = |  = |
 = |  = |  = |  = |  = |
| 56-47=9， | 10-0.27=9.73， | 5-2.5=2.5， | 6.3+0.7=7， | 6÷0.5=12， |
| 8.4÷4.2=2， | 2.5×4=10， | = ， | = ， | =1， |
| =1， | 9÷10=0.9， | = ， | = ， | =10， |
= ， | = ， | =0， | = ， | = ， |
| =21， | =8， | =， | = ， | =4， |
| =8， | =， | =6， | = ， | =4． |
分析：根据运算的法则直接求解，小数计算注意小数的位数，分数的计算注意把结果化成最简分数．
点评：完成本题要根据运算法则认真分析式中数据，然后快速准确得出答案．