=8-5=3
=10×15=150
=240:80=3
=710+290=1000
=2,3+3,7=6
=4,7-1,9=2,8
=12,4
=4/5-2/3=12/15-10/15=2/15
=7/3×9_14=3/2=1,5
=25/3÷5/9=25/3×9/5=5×3=15
