在一个不透明的瓶子里装着绿、粉、黑、白四种颜色且形状大小相同的4个玻璃球．每次摸一个球，摸完后放回，共摸60次．可能摸到多少次白球？
直接写出得数．+=÷= 3﹣1.95=×= 6.3÷0.07=÷6= 0÷=﹣=+3÷=×﹣0.75×=
+= 1﹣=1÷=﹣=×= 0÷= 0.9+99×0.9=（+）×12=．
直接写出得数 1÷=+=÷=÷3=×=﹣=÷7=÷= 4×=÷8=×=÷=÷0.5= 5×=﹣=×0= 0.3×=÷=÷4=+0.5=
直接写得数：+= 1﹣= 1÷=﹣=×= 0÷= 0.9+99×0.9=（+）×12=
直接写出得数． （1）1﹣= 1÷=﹣=×= 0÷= （2）28×0.1= 1.3×3= 2.1×0.4= 5.4÷0.9= 10﹣9.99=
+
=
÷
= 3﹣1.95=
×
= 6.3÷0.07=
÷6= 0÷
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﹣
=
+3÷
=
﹣0.75×
+
= 1﹣
=1÷
=
﹣
=
×
=
+
）×12=
．
=
+
=
÷
=
÷3=
×
﹣
=
÷7=
÷
= 4×
=
÷8=
×
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÷0.5= 5×
=
﹣
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×0= 0.3×
=
÷
=
÷4=
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+
= 1﹣
= 1÷
=
﹣
=
×
= 0÷
= 0.9+99×0.9=（
+
）×12=
=
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﹣
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×
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