李阿姨和王叔叔两人打字，李阿姨平均每秒打0.9个字，王叔叔1分钟打了50个字，平均每秒打个字，谁打字打的快？
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=
20×=÷=
24×= 15÷= ×= ÷=1÷25%= += 3×÷3×50%= （1﹣1%）÷99%=
个字，谁打字打的快？
×8= 
﹣
= 
÷3= 21×
=
= 
÷
= 
×
= 
+
=
×6= 30×
= 
÷
= 20÷
= 
+
=
×
×0= 
×
= 1÷
= 
﹣50%= 
÷6=
×15= 
÷3= 
÷
= 6×
=
= 
÷3= 2
×
= 
×
×10=
=
÷
=
= 15÷
= 
×
= 
÷
=
+
÷3×50%= （1﹣1%）÷99%=
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