3.57+1.43= 4.2× =
10-9.2= 0.6×0.6=
0.72÷0.8= 8× ÷8÷ =
2.5×40=
+ =
3.4× =
0.2÷ =
5- =
×60=
÷ =
×25%=
x
4
?
y
12
24