某班统计数学考试成绩，平均分是86分．后来发现淘气的成绩是96分，而被错误地统计为69分．重新计算后，正确的平均分时86.6分．这个班有多少名同学？
直接写得数：+= 1﹣= 1÷= ﹣=×= 0÷= 0.9+99×0.9= （+）×12=
直接写出得数．（1）1﹣=1÷=﹣=×=0÷=（2）28×0.1=1.3×3=2.1×0.4=5.4÷0.9=10﹣9.99=
直接写出得数．+=﹣= ÷= 1÷= ×=××=8×+8×= 55×÷= ×÷×= 0×+=
直接写得数5﹣= ×16= 1÷= ÷= ×=+= ﹣= 6﹣= ×6= （+）×8=
直接写得数+= ﹣= ×= ×5=2﹣= 3÷7= ÷= ÷4=
+
= 1﹣
= 1÷
= 
﹣
=
×
= 0÷
= 0.9+99×0.9= （
+
）×12=
=
=
﹣
=
×
+
=
﹣
= 
÷
= 1÷
= 
×
=
×
×
=
+8×
= 55×
÷
×
÷
= 0×
+
=
= 
×16= 1÷
= 
÷
= 
×
=
+
= 
﹣
= 6﹣
= 
×6= （
+
+
= 
﹣
= 
×
= 
×5=
= 3÷7= 
÷
= 
÷4=
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