有甲、乙、丙3个数，甲、乙的和是90．甲、丙的和是82，乙丙的和是86．甲、乙、丙3个数的平均数是多少？
直接写出得数． 14×= 9÷=﹣=+=×75%= 1÷×=（62.5%﹣）÷2= 1﹣（+）=
直接写出得数：×= 6.4×= 4﹣﹣= 1÷×= 2.5×37×4= 8.1×= 0.6÷=÷0.875﹣1=
直接写出得数+== 12×（﹣）== 1÷7+= 6.4×101﹣6= 12÷3=×××…×=
直接写出得数×= 1﹣=÷=（7+）×8= 0.1÷10%=×6= a﹣a= 12×（﹣+）=
计算．+=﹣=×=÷= 1.25××8= 1.2×= 20÷=（﹣）×30=﹣÷2= 99×÷99×=
= 9÷
=
﹣
=
+
=
×75%= 1÷
×
）÷2= 1﹣（
+
）=
×
= 6.4×
﹣
= 1÷
×
= 0.6÷
=
÷0.875﹣1=
+
=
= 12×（
）=
=
= 6.4×101﹣6
= 12
×
×
×…×
=
×
= 1﹣
=
÷
=（7+
）×8=
×6= a﹣
a= 12×（
﹣
+
）=
+
=
﹣
=
×
=
÷
=
×8= 1.2×
= 20÷
=（
﹣
）×30=
﹣
÷99×
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