Не могу решить задания:
1) log5 150 - log5 3 + log5 1/2 - log5 1
2)10^2-3lg 5
3)Упростить выражение 
-a + 1
Ответы на вопрос
Ответил Аноним
0
1)log₅150-log₅3+log₅1/2-log₅1=log₅(150:3)+log₅1/2-0=log₅50+log₅1/2==log₅(50*1/2)=
log₅25=2
2)
![10^{2+3lg5}=10^{2}*(10^{lg5})^{3}=100*5^{3}=12500 \
3) frac{2a^{2}+5a-12}{20-3} -a+1= frac{2a^{2}+5a-12}{17} -a+1= frac{2a^{2}+5a-12+17*(-a+1)}{17} = \
frac{2a^{2}+5a-12-17a+17}{17} = frac{2a^{2}-12a+5}{17} \](https://tex.z-dn.net/?f=10%5E%7B2%2B3lg5%7D%3D10%5E%7B2%7D%2A%2810%5E%7Blg5%7D%29%5E%7B3%7D%3D100%2A5%5E%7B3%7D%3D12500+%5C+%0A3%29+frac%7B2a%5E%7B2%7D%2B5a-12%7D%7B20-3%7D+-a%2B1%3D+frac%7B2a%5E%7B2%7D%2B5a-12%7D%7B17%7D+-a%2B1%3D+frac%7B2a%5E%7B2%7D%2B5a-12%2B17%2A%28-a%2B1%29%7D%7B17%7D+%3D+%5C+%0A+frac%7B2a%5E%7B2%7D%2B5a-12-17a%2B17%7D%7B17%7D+%3D+frac%7B2a%5E%7B2%7D-12a%2B5%7D%7B17%7D++%5C+ "10^{2+3lg5}=10^{2}*(10^{lg5})^{3}=100*5^{3}=12500 \
3) frac{2a^{2}+5a-12}{20-3} -a+1= frac{2a^{2}+5a-12}{17} -a+1= frac{2a^{2}+5a-12+17*(-a+1)}{17} = \
frac{2a^{2}+5a-12-17a+17}{17} = frac{2a^{2}-12a+5}{17} \")
log₅25=2
2)
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