画一个半径1cm的圆，并用字母O、r、d标出它的圆心、半径和直径．
直接写得数．0.6÷3= 357+199= 48÷1%= 241﹣103=2﹣= 1÷0.2= 0.62= ×=×2÷×2=
直接写出得数．1.2+3.58= 400÷25÷8= = 0.9+99×0.9== 69×= ×8÷= （）×4=
直接写出得数．①×1.6= ②0.8÷0.01= ③3.6÷40= ④÷=⑤+6.25= ⑥0.74×100= ⑦0.375÷= ⑧40×101=
直接写出得数2008﹣123= 8.2+1.18= 2.5×4= +×9=9.8÷0.1= ×= 3××= ÷×=
直接写得数﹣= ×= += 1.03+0.07=1÷0.4= ×25%= 0.05×100= 0.6：0.36=
= 1÷0.2= 0.62= 
×
=
×2÷
= 0.9+99×0.9=
= 69×
= 
×8÷
）×4=
×1.6= ②0.8÷0.01= ③3.6÷40= ④
÷
=
+6.25= ⑥0.74×100= ⑦0.375÷
= ⑧40×101=
+
×9=
×
= 3×
×
= 
÷
×
=
﹣
= 
×
= 
= 1.03+0.07=
×25%= 0.05×100= 0.6：0.36=
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