3.14×9= 7.2×= 1.25××0.8=
3.14×2.25= 12×()=
21×=
÷3=
=
0×=
4×+4×=
÷10= ÷= += ÷=
×2.4= ÷= ×= -=
×÷×= 24×(++)=
×16= ×= ÷9= ÷=
3.6÷= ×= 24÷20%= ×=
×3= ×= ×= ÷= (+)×15=
÷2= ÷= ÷= ×= 12÷(1-)=