+=
=
X-80%X=0.4
X+ =
X+ 25%X=25
×37.5%= × = 2.8÷70%= 0× + =
1.2×3.14= × = 0.62= ÷40%=
÷= ×= 12×= + ×=
÷= ÷= 0×= =
3.14×9= 7.2×= 1.25××0.8=
3.14×2.25= 12×()=
1.2× 1.2
÷0.01