1、[9+3/4-(6+7/10)]÷5=(3-1/20)×1/5=59/100
2、[17+1/2-(2+1/2)]÷60%=15÷3/5=25
3、[(7+1/2)+(3+2/5)]-(4+3/5)=(10+9/10)-(4+6/10)=6又3/10
4、(6+1/2)÷[(2+2/5)-1]=13/2÷7/5=13/2×5/7=65/14=4又9/14
1、[9+3/4-(6+7/10)]÷5=(3-1/20)×1/5=59/100
2、[17+1/2-(2+1/2)]÷60%=15÷3/5=25
3、[(7+1/2)+(3+2/5)]-(4+3/5)=(10+9/10)-(4+6/10)=6又3/10
4、(6+1/2)÷[(2+2/5)-1]=13/2÷7/5=13/2×5/7=65/14=4又9/14