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jujulakaeuaws
24.11.2020 •
Mathematics
Lg(5x+10)+2lg3=1+lg(4x+12)
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Ответ:
x=6
Step-by-step explanation:
log(5x+10)-log(4x+12)=1-2log(3)
log(5x+10/4x+12)=1-2log(3)
log(5x+10/4x+12)=log(10)+log(3^-2)
log(5x+10/4x+12)=log(10×3^-2)
log(5x+10/4x+12)=log(10×1/9)
log(5x+10/4x+12)=log(10/9)
5x+10/4x+12=10/9
9(5x+10)=(4x+12)10
45x+90=40x+120
5x=30
x=6
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Ответ:
A shop owner offered a 20% discount off the regular price of a mirror. The amount of the discount is $3
Step-by-step explanation: