口算.4.3+5.7= 1100×4= 140×5= (49﹣9)÷8=54÷6= 720﹣80= 35+27= 0.4+0.5﹣0.3=
4935÷47+5.4×8.5
0.56×=
÷50%=
11.75- 1.7=
3.6×0.25×4=