1÷= = 1.1+0.11= 2.4×50%= 0.24÷0.8=
= 8×= 10﹣0.99= 0.22= 4×25%÷4×25%=
4+0.7x=102
(+)×9= 1.5×100= 99×0.8+0.8= 42=
+= 7﹣= ×= ÷=
307﹣299= += ×0.63= A﹣A=
5.2﹣0.6= ÷= ×= 4.25×4=
25%+1.75=
0.8×1.25=
1﹣ ﹣75%=
+ ÷ =
2÷0.02=
÷ =
0.625×8=
× ÷ × =