⑴3.6×=
3.6+=
3.6-=
3.6÷=
⑵3.14× 6=
=
21.98÷3.14=
3.14×=
⑶20×50%=
4.5÷50%=
:0.35=
24:=
⑷( ):=3
()×12=
1-=
×30= ÷ = + = ÷ = 0× =
3.2÷0.4= 5- = × = 1.21× = ÷2.2=
= = = =
= = 7π= =
×24= 24÷=
÷2= 35÷= 25×20%=
×= ÷= 1÷20%= 1.25×8=
0÷= 8÷= ×2.8= ÷0.4=