Найдите значение выражения при a= -4,2
[tex]\left(\frac{1}{5a}+\frac{1}{7a}\right)\cdot \frac{a^{^2}}{8}[/tex]
[tex]\left(\frac{1}{5a}+\frac{1}{7a}\right)\cdot \frac{a^{^2}}{8}[/tex]
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Ответ:
Объяснение:
((1/5a)+(1/7a))*a²/8=((7a+5a)/(5a*7a))*a²/8=(12a/35a²)*a²/8=
=12a*a²/(35a²*8)=3a/(35*2)=(3/70)*a=(3/70)*(-4,2)=
=(3/70)*(-4¹/₅)=(3/70)*(-21/5)=-63/350=-9/50=-0,18.