The teaching plan of our school is
Learn first 1 and 4 (last semester)
Learn 5 more 2s (next semester)
Compulsory 3 is a class of senior two.
1, 4,5 are mainly algebraic parts, including sets, functions (trigonometric functions, logarithmic functions and exponential functions), sequences, vectors and inequalities.
2, 3 is the geometry part. You should only learn 2 in Grade One, including solid geometry and analytic geometry (lines and equations, circles and equations, etc. ).
a 1+a2+¡¡a(n- 1)+an=n^2an
& gt& gta 1+a2+¡¡a(n- 1)=(n^2- 1)an
& gt& gt£¿ s(n- 1)=(n^2- 1)[sn-s(n- 1)]
& gt& gtsn/s(n- 1)=n^2/(n^2- 1)=n/(n+ 1)*n/(n- 1)
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