Question

ゆ

至急です！明日テストなんです！何故こういう式変形になるのですか

1
66 (1) -
√√k+2+√√k+3
√√√k+2-√√k+3
+1
Jeb
(√√k + 2 + √√k + 3) (√√k+2-√k+3)
√√k+2 √√k+3
-
(k+2)-(k+3)
よって
n
1
=√√k+3-√√k+2
S-S. &+ "S.S+ "S=2S (&)
k = 1 √√k + 2 + √√k + 3 + S
n
=Σ(√√k+3√√k+2)
k=1
74
=2
SEAR
=(√√4 −√3)+(√5-√√4)+(√√6-√5)
+
+(√√n+3-√√n + 2)
"S)S
I-S
(2)=√n+3-√√3

数列の和