用3、5、4、0四张数字卡片，能摆出 个不同的两位数；在这些两位数中，素数有 个，偶数有 个， 和 有公因数3、5．
直接写出得数．== 71.83÷8≈ 5.04×9.85≈=== 0.53=
直接写得数======= 60×60%= 2×32==
直接写出得数．×8=÷2=×=÷=÷=﹣0.6=×=÷10=+=÷= 16×= 1﹣7%=
直接写得数． 1÷=÷2= 4×20%=×4= （+）×12= 1÷75%= 1%÷10%= 42%﹣0.42=
直接写得数． 12×= 6÷=÷= 1÷×=×18=×0×=×=×26=
=
= 71.83÷8≈ 5.04×9.85≈
=
=
= 0.53=
=
=
=
=
=
=
= 60×60%= 2×32=
=
×8=
÷2=
×
=
÷
=
÷
×
=
÷10=
+
=
= 16×
= 1﹣7%=
=
÷2= 4×20%=
×4=
+
）×12= 1÷75%= 1%÷10%= 42%﹣0.42=
= 6÷
=
÷
= 1÷
×
=
×18=
×0×
=
×
=
×26=
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