把2米长的竹竿直立在地上，量得它的影长是l.6米，同时量得一棵大树的影长是5.6米．你知道这棵大树有多高吗？（用比例解．）
直接写出复数．×= 1÷= ÷8= 7×= ×12=×= ﹣= += ÷= 14÷=
直接写出得数．0.56+0.25= ﹣（﹣）= 0÷= （+）×6=+= ×= 8÷= 1+8%=
直接写结果﹣= 570÷ ×20= +3.5=11﹣﹣= ×= 1÷= 10﹣=÷= 19.9+19.9×99=
直接写出得数．﹣= 12×= ÷26= +=×= += 1÷= ×=
口算﹣= += ×= ÷7=
×
= 1÷
= 
÷8= 7×
= 
×12=
×
= 
﹣
= 
+
÷
= 14÷
=
﹣（
﹣
）= 0÷
= （
）×6=
+
= 
×
= 8÷
﹣
= 570÷
×20= 
﹣
= 
×
= 1÷
= 10﹣
=
÷
= 19.9+19.9×99=
﹣
= 12×
= 
÷26= 
+
=
×
= 
+
= 1÷
= 
×
=
﹣
= 
+
= 
×
= 
÷7=
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