1. 
}{-ar(r^2-1)}= "\frac{-ar(r^4-r)}{-ar(r^2-1)}=")
(r-1))}{(r+1))(r-1)}= "\frac{(r^3+r^2+r)(r-1))}{(r+1))(r-1)}=")
}{(r+1)} "\frac{(r^3+r^2+r)}{(r+1)}")
2. a + (a+b)+(a+2b)+(a+3b)+ 1/4 = 10
4a + 6b + 1/4 = 10 (x 4)
16a + 24b + 1 = 40
16a + 24 b = 39 ............ *
u5 --> a + 4b = 1/4 ....... **
16a + 24b = 39
a + 4b = 1/4 (x16)
16a + 24b = 39
16a + 64b = 4
____________ -
- 40b = 35
b = - 35/40
a + 4 (-35/40) = 1/4
a + (-35/10) = 1/4
a = 15/4
u3 = a + 2b
= 15/4 + 2 (-35/40)
= 2
2. a + (a+b)+(a+2b)+(a+3b)+ 1/4 = 10
4a + 6b + 1/4 = 10 (x 4)
16a + 24b + 1 = 40
16a + 24 b = 39 ............ *
u5 --> a + 4b = 1/4 ....... **
16a + 24b = 39
a + 4b = 1/4 (x16)
16a + 24b = 39
16a + 64b = 4
____________ -
- 40b = 35
b = - 35/40
a + 4 (-35/40) = 1/4
a + (-35/10) = 1/4
a = 15/4
u3 = a + 2b
= 15/4 + 2 (-35/40)
= 2
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