学校唱歌兴趣小组有25人，舞蹈小组有38人，美术组的人数是唱歌组和舞蹈组总人数的3倍，美术组有多少人？
直接写得数．×16= 12÷= 0.3×=÷= 1÷= 0×== =
直接写得数4÷= 0×= ÷= ×1.4= ×=0÷= ×10= 30×0.05=
直接写出得数．= = = == = = =
口算．4.2÷= ×3= ÷5= （+）×72=×12= ×1.8= ÷=
= = = == = = =
×16= 12÷
= 0.3×
=
÷
= 1÷
= 0×
=
= 
=
= 0×
= 
÷
×1.4= 
×
= 
×10= 30×0.05=
= 
= 
= 
=
= 
= 
= 
=
= 
×3= 
÷5= （
+
）×72=
×12= 
÷
= 
= 
= 
=
= 
= 
= 
=
粤公网安备 44130202000953号