（1）我要摸到一个黑球，应在 号盒子里摸．（2）我要摸到一个白球，在 号箱子容易摸到．
直接写得数．25×= ÷6= ×16= ÷= 1÷= ×=
直接写出得数÷= 20×= ÷= ﹣=12÷50%= 3﹣﹣= 60×20%= ÷26=+= 1﹣3%=
直接写出得数×4= 6﹣= ÷= 6÷1%=1÷= ×= ×0÷= 10+×=××5×7= 0.99×9+0.99=
直接得数．×21= ×= 15÷= ÷1﹣65%= 1+65%= ÷= ×=
直接写得数．×= ×= ×= ×2= 5﹣=12×= 1÷= +×= （6+）×= ×39×=
= 
÷6= 
×16= 
÷
= 1÷
= 
×
=
÷
= 20×
÷
= 
﹣
=
= 60×20%= 
÷26=
+
= 1﹣3%=
×4= 6﹣
= 
÷
= 6÷1%=
= 
×
= 
×0÷
×
=
×
×5×7= 0.99×9+0.99=
×21= 
×
= 15÷
= 
÷
÷
= 
×
=
×
= 
×
= 
×
= 
=
= 1÷
= 
+
×
= （6+
）×
×39×
=
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