Find the rule to fill in the number and solve the application problem~ 30 25 20 40 34 28 50 26 Find the rules and fill in the numbers Average problem: 198 natural numbers, 1,2,3 , 198 are divided into three groups averagely, and the average numbers of these three groups are equal. What is the sum of these three average numbers?
25×2=30+20;
34×2=40=28;
SO 2 ×? = 50 + 26 = 76;
=38;
Average = (1 + 2 +.. + 198) △ 3 △ 3
=(1+198)×198÷2÷9
=199×11
=(200-1)×11
=2200-11
=2189;
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