7*9+12/3-2怎樣等於47,加括弧,7*9+12/3-2怎樣等於75 90-60/15+5*9=41,90-60/15+5*9=47

7*9+12/3-2怎樣等於47,加括弧,7*9+12/3-2怎樣等於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