mencoba gunakan latex untuk ekspresi matematik


soal uan Mat IPA 2009
20. Nilai \lim_{x \rightarrow ~} \sqrt {25x^2-9x-16} -5x + 3 = ….
a. –\frac{39}{10}
b.-\frac{9}{10}
c. \frac{21}{10}
d. \frac{39}{10}
e. ~
Jawab. A

21. Nilai \lim_{x \rightarrow 3} \frac {x^2-9}{\sqrt{10+2x}-(x+1)} = ….
a. -8
b. -6
c. 4
d. 6
e. 8
Jawab a.
\frac{x^n-1}{x-1} = \sum_{k=0}^{n-1}x^k hasilnya gimana

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