×10= 0.75+ = × = 3.14×4= ÷5+5÷ =
÷ = - = 75%÷ = 8×3.14= 0.9×9+0.99=
÷80%= - = 13- = 12×3.14= ×0× =
8×12.5%= ÷ = ÷9= 22×3.14= ÷ × ÷ =
÷0.6= 16× = + = 3.14×52= + - =
+ = 40%÷4%= 0.4- = 7×3.14= ÷( - )=
÷28= ÷20%= 108÷ = 3.14×82= ÷5×0.6=
× = 2-80%= 30%+25%= 2×3.14×8= - + - =
÷ = 37.5%- = 75%×0.2= 2×3.14×10= + × =
20÷( )= =( )(小数)=( )%=( )折=( )成。