东辰中学植树节三个班植树，任务分配是：甲班要植三个班总数的40%，乙、丙两班植树棵数的比是4：3．当甲班植了200棵树时，正好完成三个班植树总棵数的．求丙班植树多少棵？
直接写得数： 7.2×= 1÷==×0.3= 10÷0.1×10÷0.1= 3=+=== 18=
计算下面各题×=×8= 6×= 27﹣= 22÷=×= 54÷=+= 1﹣=﹣= 16×=÷=
直接写得数． 3×= 1÷=÷=+= 0÷=×=÷= 6×=
×4=×=+=×=×=÷= 0÷=×= 0×10=×=+=﹣= 0÷=÷=×4= 3×1=+=﹣= 1÷（﹣）= 4÷×4=
直接写出得数．= 16×50%= 16÷==÷3== 4÷1%= 2+1÷= 7+= 1÷=
= 1÷
=
=
×0.3=
=
+
=
=
= 18
=
×
=
×8= 6×
= 27﹣
= 22÷
=
×
=
=
+
= 1﹣
=
﹣
= 16×
=
÷
= 1÷
=
÷
=
+
=
=
×
=
= 6×
=
×4=
×
=
+
=
×
×
=
÷
= 0÷
×
= 0×10=
×
=
+
=
﹣
= 0÷
=
÷
=
×4=
1=
=
﹣
= 1÷（
﹣
）= 4÷
×4=
= 16×50%= 16÷
=
=
÷3=
= 4÷1%= 2+1÷
= 7+
= 1÷
=
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