a, Nhận xét : đây là dãy số cách đều 0,4 đơn vị .
Hiệu của số hạng thứ 100 với số đầu tiên là :
0,4 x ( 100 - 1 ) = 39,6 ( đơn vị )
Số hạng thứ 100 của dãy đó là :
0,1 + 39,6 = 39,7
b, Tổng của 100 số hạng đầu tiên của dãy đó là :
( 39,7 + 0,1 ) x 100 : 2 = 1990
Đáp số : a, 39,7 .
b, 1990 .
a)Số hạng thứ 100 là;
0,1+(0,5-0,1)x(100-1)=39,7
b)0,1+0,5+0,9+1,3+1,7+...........+39,7
=(0,1+39,7)+(0,5+39,3)+.......
50 cặp
=39,8+39,8+39,8+.....+39,8
50 số
=39,8x50=1990
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