<u>1-й член:</u>
х1 = -1*(2-1)/(3+1) = -1*1/4 = -1/4
<u>5-й член:</u>
х5 = -1*(2*5-1)/(3+5)= -9/8
<u>100-й член:</u>
х100 = 1*(2*100-1)/(3+100) = 199/103
1) 1 922 800 : 38 = 50 600
2) 215 : 215 = 1
3) 1 + 739 = 400
4) 400 * 0 = 0
5) 873 200 : 8732 = 100
6) 50 600 * 100 = 5 060 000
7) 5 060 000 - 34 816 = 5 025 184
8) 5 025 184 * 0 = 0
9) 0 * 1 =0
2 3/7 + 14/19 + 5 4/7 + 5/19 = (2 3/7 + 5 4/7) + (14/19 + 5/19) = 7 7/7 + 19/19 =
8 + 1 = 9
2 5/18 + 4/81 + 3 7/18 + 4 5/81 = (2 5/18 + 3 7/18) + (4/81 + 4 5/81) = 5 12/18 + 4 9/81 = 5 6/9 + 4 1/9 = 9 7/9
3 5/11 + 1 3/16 + 2 5/16 + 4 6/11 = (3 5/11 + 4 6/11) + (1 3/16 + 2 5/16) = 7 11/11 + 3 8/16 = 8 + 3 1/2 = 11 1/2
3=6/2=9/3
1=5/5=100/100
8=16/2=40/5
15=30/2=45/3