甲、乙、丙3人原有彩球数的比是9：4：2，甲给了丙24个彩球，乙也给了丙几个彩球，现在甲、乙、丙3人彩球数的比变为2：1：1．乙给了丙多少个彩球？
直接写得数= = 81×= 0÷== = = =
直接写出得数21×= ÷2= ﹣= 12÷=÷0.8= 12÷= 4﹣2= 14×÷14×=
计算：+= ﹣= 12×= ÷=0×+9= ÷3= ×14= 20÷=1.25××8= 14×÷14×=
+= 6÷= ×0.25= ÷=×= 9﹣= ÷42= 1÷=
口算= = = =÷= ×36= ÷3= 6÷=
= 
= 81×
= 0÷
=
= 
= 
= 
=
= 
÷2= 
﹣
= 12÷
=
÷0.8= 12÷
= 4﹣2
÷14×
=
+
= 
﹣
= 12×
= 
÷
=
+9= 
÷3= 
×14= 20÷
=
×8= 14×
÷14×
+
= 6÷
= 
×0.25= 
÷
=
×
= 9﹣
= 
÷42= 1÷
=
= 
= 
= 
=
÷
= 
×36= 
÷3= 6÷
=
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