15﹣0.3= 6﹣0.5= 2.13+14= 0.91+1.25= 10﹣0.76=0.567+4.44= 0.37+0.6= 7.46+2.54= 45.9+1=
x-x=
(2.5-2.5× 0.6)÷0.4
o.5÷[一(一]]
47.3-1.7×5-1.5
2013-1728÷32