7*9+12/3-2怎样等于47,加括号,7*9+12/3-2怎样等于75

问题描述:

7*9+12/3-2怎样等于47,加括号,7*9+12/3-2怎样等于75
90-60/15+5*9=41,90-60/15+5*9=47

7*(9+12)/3-2=47
(7*9+12)/(3-2)=75
90-(60/15+5*9)=41
(90-60)/15+5*9=47