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Daryawhitestar
@Daryawhitestar
August 2022
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ПОМОГИТЕ , пожалуйста
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kratgv
Verified answer
1)х²-8х=9 по опр логарифма
х²-8х-9=0
корни -1 и 9
2) 0,25=х-1
х=1,25
3)(х+1)в -2 степени =4
1/(х+1)²=4
4(х+1)²=1
4х²+8х+4-1=0
4х²+8х+3=0
Д-64-4х4х3=64-48=16, √Д=4
корни х=-0,5 и х=-1,5
9) х-4>0, х>4
х-4=2²
х=8
10) х>0
log по осн 3 (lgх) =2
lgx=9
x=10 в девятой степени. х=1000000000
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Answers & Comments
Verified answer
1)х²-8х=9 по опр логарифмах²-8х-9=0
корни -1 и 9
2) 0,25=х-1
х=1,25
3)(х+1)в -2 степени =4
1/(х+1)²=4
4(х+1)²=1
4х²+8х+4-1=0
4х²+8х+3=0
Д-64-4х4х3=64-48=16, √Д=4
корни х=-0,5 и х=-1,5
9) х-4>0, х>4
х-4=2²
х=8
10) х>0
log по осн 3 (lgх) =2
lgx=9
x=10 в девятой степени. х=1000000000