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Nguyễn Thị Thu Trang

Trung bình cộng của các số tròn chục nhỏ hơn 100 là?

Trần Tuyết Như
25 tháng 3 2015 lúc 12:42

số tròn chục nhỏ nhất nhỏ hơn 100 là: 10

số tròn chục lờn nhất nhỏ hơn 100 là: 90

và khoảng cách giữa các số tròn chục là 10, nên ta có:

số số hạng là:  ( 90 - 10 ) : 10 +1 = 9

tổng của các số đó là: [(10 +90)  x 9] : 2 = 450

trung bình cộng các số đó là: 450 : 9 = 50

ĐS; 50

1 đúng nhé

Nguyen Hoang Hai
26 tháng 3 2017 lúc 12:54
 

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