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missisangel199
@missisangel199
July 2022
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VovchikSAGAN
3^x+1=27^x-1
3^3=27
3^x+1=3^3x-3
x+1=3x-3
x+1-3x-3=0
2x-4=0
x=2
2)0,2^x²+4x-5=1
0,2^0=1
x²+4x-5=0
D=4²+20=√36=6
x=2\2=1 x=-10\2=-5
3)2^x+3-2^x+1=12
2^x*2^3=2^x*8=16^x
2^x+1=2^x*2=4^x
16^x-4^x=12
16-4=12
x=1
2 votes
Thanks 1
missisangel199
последние 2 строчки: 16-4=12, х=1, разве не "х=12"??
VovchikSAGAN
нет х=1 16^1-4^1=12
missisangel199
спасибо большое
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Answers & Comments
3^3=27
3^x+1=3^3x-3
x+1=3x-3
x+1-3x-3=0
2x-4=0
x=2
2)0,2^x²+4x-5=1
0,2^0=1
x²+4x-5=0
D=4²+20=√36=6
x=2\2=1 x=-10\2=-5
3)2^x+3-2^x+1=12
2^x*2^3=2^x*8=16^x
2^x+1=2^x*2=4^x
16^x-4^x=12
16-4=12
x=1