如图是学校在山上植树情况的统计图，根据统计图回答问题．①平均每种树种多少株？②杨树比银杏树和松树的总和多多少棵？
= 2.5= = 1== 1×= 3÷1%= =．
×0= ×= ÷= ÷=
直接写得数×8= ﹣= ÷3= 21×=2÷= ÷= ×= +=
直接写得数．×6= 30×= ÷= 20÷= +=××0= ×= 1÷×= ﹣50%= ÷6=
直接写得数．×15= ÷3= ÷= 6×=72÷= ÷3= 2×= ××10=
= 2.5
= 
= 1
=
= 1
×
= 3÷1%= 
=．
×0= 
= 
= 
=
×8= 
﹣
= 
÷3= 21×
=
= 
÷
= 
×
= 
+
=
×6= 30×
= 
÷
= 20÷
= 
+
=
×
×0= 
×
= 1÷
= 
﹣50%= 
÷6=
×15= 
÷3= 
÷
= 6×
=
= 
÷3= 2
×
= 
×
×10=
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