欢欢在期末考试时，数学成绩公布前他四门功课的平均分数是92分；数学成绩公布后得知他得了87分，此时他五门功课的平均分是多少分？
直接写得数：+= 1﹣=×=+25%=÷8= 4×25%= 0.36÷36%= 1﹣20%﹣=
直接写得数 3÷=×=÷﹣=÷0.5= 2﹣=（1﹣）÷=
计算．====×26= 12÷=×=÷=
直接写出的数．====%======
只列式不计算﹣= 1.25×8= 2.7×=÷2= 1÷0.8=×= 1﹣÷1﹣=×0.8+×=
+
= 1﹣
=
×
=
÷8= 4×25%= 0.36÷36%= 1﹣20%﹣
=
=
×
=
÷
÷0.5= 2﹣
=（1﹣
）÷
=
=
=
=
×26= 12÷
=
×
=
÷
=
=
=
=
=
%=
=
=
=
=
=
﹣
= 1.25×8= 2.7×
=
÷2=
×
= 1﹣
÷1﹣
×
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