箱子里面有红、白两种玻璃球，红球数比白球数的
倍多两个，每次从箱子里取出
个白球，
个红球。如果经过若干次以后，箱子里只剩下个白球，
个红球，那么，箱子里原有红球比白球多多少个?
直接写得数．
1﹣
+1﹣=
﹣
= 2.25×4= 0.67+0.33=
÷
=
×80%=（+
）×12= 45%÷15%=
直接写出得数．
﹣
=12﹣0.12= 5.8+8= 48+32=
32= 0÷
= 4÷4%= 0.6×0.5= 
×
=
+
=1÷
=
+5= ．
+
= 24×
= 5﹣
=
÷
= 40×
=×0.5= 0.4÷
=
﹣
=
÷0.4=
+
=
直接写出结果．
﹣
= 4.5×102= 341﹣103= 270÷18=
10×10%= 5﹣0.25+0.75= 0.42﹣0.32= 2÷
=
×6= 4.57+6.43= 7×
÷7×= 1÷
×
=
直接写出得数．
382﹣297﹣3=
= 2÷
=
=
4﹣6= 4.98+0.02= 1÷0.01=（
）×72=
25÷5=
=