幸福街小学有50人参加了植树活动，一共植树150棵，平均每人植树多少棵？
口算：+= 3﹣2= 1÷1= 7×÷7×=5÷5= ×1.2= ×1= （+）×20=
直接写得数．4÷40%= ×= 20×5.5= （+）×4=﹣= 2.9+3.4= 0.1÷0.01= 6﹣﹣=÷3= 6×= ÷= 1÷﹣÷1=
直接写出得数+= ×= 1﹣20%﹣= 4×== +25%= 3﹣= =
直接写得数．= 4﹣1.63= = == = = == 27×5%= %= =
直接写得数+= ﹣= ×= ×=×÷×= += ×0+3= 3+1.75=÷= （+）×=
+
= 3﹣2
= 1
÷1= 7×
÷5= 
×1.2= 
×1
= （
+
）×20=
×
= 20×5.5= （
+
）×4=
﹣
= 2.9+3.4= 0.1÷0.01= 6﹣
﹣
=
÷3= 6×
= 
÷
= 1÷
﹣
÷1=
+
= 
×
= 1﹣20%﹣
= 4×
=
= 
+25%= 3﹣
= 
=
= 4﹣1.63= 
= 
=
= 
= 
= 
=
= 27×5%= 
%= 
=
+
= 
﹣
= 
×
= 
×
=
×
÷
= 
= 
×0+3= 3
+1.75=
÷
= （
+
）×
=
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