任意给定的七个不同的自然数，求证其中必有两个数，其和或差是10的倍数．
直接写得数．÷3= 10÷=÷=×=÷=×= 4×= 1﹣=×60=×=×=××=÷5= 30÷=÷=×÷=
直接写出得数． 16×=×=×=÷=÷= 9÷=××=
直接写得数×5=÷= 10×=÷=×÷×= 99×+= 3﹣﹣= 1÷4×= （）÷6=÷÷1=
直接写出得数．×40== 25×==== 1﹣50%=÷==×=
直接写得数．×=÷2=×14= 10×=×2=×=÷=÷=
÷3= 10÷
=
÷
=
×
=
÷
=
×
= 4×
= 1﹣
=
×60=
×
=
×
×
×
=
÷5= 30÷
=
÷
=
×
÷
=
=
×
=
×
=
÷
=
÷
= 9÷
=
×
×
=
×5=
÷
= 10×
=
÷
=
×
÷
×
+
= 3﹣
﹣
= 1÷4×
=
）÷6=
÷
÷1=
×40=
= 25×
=
=
=
= 1﹣50%=
÷
=
=
×
=
×
=
÷2=
×14= 10×
=
×2=
×
=
÷
=
÷
=
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