口算.39÷= (0.21+0.7)÷7= (﹣)×20= (0.56+0.69)×8=×3÷×3= 11.75﹣(+5)= 7﹣4÷= 2﹣×=
(+一)×48
12.5×16×3.8
4935÷47+5.4×8.5
0.56×=
÷50%=