+=
-=
1-=
+=
2-=
×=
×2=
×13=
45×20= 48+52= 0.48÷0.08= 1.25×8×0=
21÷3×7= 1+ = 9- - = + =
3.6÷0.3= 10.2×0.6= 7.8×6÷7.8×8= 6.8-3.2-1.8=
7.8-0.25= 9.8+4= 15.6×(3.9+6.1)= 12.5÷1.25÷10=
6×= = = 14÷=
0÷= ×6= 1÷= =