1.(lg8+lg18)/(2lg2+lg3)=lg144/lg12=2
2.2(cosπ/8+sinπ/8)^2=2(cos^2 π/8+sin^2 π/8 + 2sinπ/8cosπ/8)=2(1+√2/2)=2+√2
3.a=9/7,b=18
(a^2-5ab)/(a^2 b)×b^2/(a-5b)=(a(a-5b))/(a^2 b)×b^2/(a-5b)=b/a=(a^2-5ab)/(a^2 b)×b^2/(a-5b)=(a(a-5b))/(a^2 b)×b^2/(a-5b)=b/a=(a^2-5ab)/(a^2 b)×b^2/(a-5b)=(a(a-5b))/(a^2 b)×b^2/(a-5b)=b/a=14
4.logab^5-logabc+logac=5logab-logab-logac+logac=4logab
5.|14/3-24/5|=|(70-72)/15|=2/15
2.2(cosπ/8+sinπ/8)^2=2(cos^2 π/8+sin^2 π/8 + 2sinπ/8cosπ/8)=2(1+√2/2)=2+√2
3.a=9/7,b=18
(a^2-5ab)/(a^2 b)×b^2/(a-5b)=(a(a-5b))/(a^2 b)×b^2/(a-5b)=b/a=(a^2-5ab)/(a^2 b)×b^2/(a-5b)=(a(a-5b))/(a^2 b)×b^2/(a-5b)=b/a=(a^2-5ab)/(a^2 b)×b^2/(a-5b)=(a(a-5b))/(a^2 b)×b^2/(a-5b)=b/a=14
4.logab^5-logabc+logac=5logab-logab-logac+logac=4logab
5.|14/3-24/5|=|(70-72)/15|=2/15
Комментариев нет:
Отправить комментарий