4π=
8π=
10π=
12π=
×20= ÷= 10÷= 0.6×=
1÷= ×= ÷= ÷=
2.1×
×2015
×34×7×
101×-
=
5.4÷0.09= 7.75+3.86-7.75+1.14= 2.5×0.99×0.4=
26.2+38= 40×0.1÷0.001= 56.27- 3.73-46.27=