+0.375=
0.2²=
910÷70=
12-2=
()×24=
×11=
÷5=
1-×2=
25×4%=
=
365+199= 40÷90= 0.8÷10%= 5.98+0.2= 2.5×400=
- = ÷ = 1÷ = + = × ÷ × =
b=。