8×0.5=0.2×20 或。
15×0.2=
3.14×3²=
6÷6%=
8.9×11-8.9=
7÷=
×÷=
-=
+÷4=
205+97= 3.01﹣0.1= 0.25×3×4= 36×25%=
3×a×a= ×1.6= 4÷25%= 16.4+3.06=
1﹣ ÷ = ( ﹣ )÷ =
1-0.92= - = ×3.2= ÷ ×5=
3.5+4.28= × = ÷ = 99×0.9+0.9=