用1、4、9、0四张数字卡片，一共可以组成多少个不同的四位数？
×=÷6=
直接写得数÷7= 42×= 6÷= ×33=÷= += 10÷1%= ﹣20%=﹣= 24×50%=
直接写出得数．= 15= = =0.33= = = =1﹣= = = =
×= 1÷= 4×60%= 0.875÷0.125=÷2= 10÷= ×3.6= 0×=
直接写得数．= = 1÷40%== = 72×25%==
×
=
÷6=
÷7= 42×
= 6÷
= 
×33=
÷
= 
+
= 10÷1%= 
﹣
= 24×50%=
= 15
= 
= 
=
= 
= 
=
= 
= 
= 
=
×
= 1÷
= 4×60%= 0.875÷0.125=
= 
×3.6= 0×
=
= 
= 1÷40%=
= 
= 72×25%=
=
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