3.9+15.34=
※40.25﹣8.5=
3600÷[(28+8)÷4] (220-150÷25)×3
61+39÷3+97=1
8+28÷4-2×3=6
2.3×6= 6.5÷0.01= 0.36÷0.4= +=
0.82= 1.2×= -= 4.3÷2.5÷4=
7.15﹣1.5= +0.25=