x+9=30 x+32×=28 3y﹣20%y=56
2.5×40=
+ =
3.4× =
0.2÷ =
5- =
×60=
÷ =
×25%=
196﹣69=
× =
6.22+44.78=
6÷2%=
3﹣3÷7=
+ ÷ =
598+403≈
0.125×3.2=
24÷ =
0.5×0.6÷0.5×0.6=
5x﹣2.4x=52
9:0.5=x:
16÷20%= 4.8÷(0.4+1.2)=
-(-)= 12÷0.25÷4=