举报
石石最棒
一。9.9-9.9*(9.9-9.9) =9.9×(1-9.9+9.9) =9.9×1 =9.9; 二。36*3/4+53*3/4-75% =36×(3/4)+53×(3/4)-3/4 =(36+53-1)×(3/4) =88×(3/4) =22×3 =66; 三2/9÷(4/15*5/6+5/6) =(2/9)÷((5/6)×(4/15+1)) =2/9÷((5/6)(19/15)) =(2/9)×(6/5)×(15/19) =20/19; 四.605*99+605 =605×(99+1) =60500; 五.[1/2-(1/3-1/4)]÷5/24 =1/2×(24/5)-(1/3)×(24/5)+(1/4)×(24/5) =12/5-8/5+6/5 =10/5 =2