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kjgh
@kjgh
November 2021
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помогите сделать 4.151,152,153,154
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litanalove
4.151
5x² -127 = -(127 -5x²) , тк степень отрицательная, то дробь переворачиваем
(28/5)^(28x²-5) =(28/5)^(127-5x²)
28x²-5 =127-5x²
28x²+5x² =127+5
33x² =132
x² =132/33
x² =4
x =+4
4.152 остальное решаем наподобие
(19/7)^(19x²-3) =(19/7)^(19-3x²)
19x² -3 =19-3x²
19x²+3x² =19+3
22x² =22
x² =1
x =+-1
4.153
(21/6)^(29x²-8x) =(21/6)^(29x-8x²)
29x²-8x =29x-8x²
29x²+8x² =29x+8x
37x² -37x =0
37x(x-1) =0
x =0; x-1=0; x =1
1 votes
Thanks 1
466961dom
http://znanija.com/task/20234914 - помоги
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Answers & Comments
5x² -127 = -(127 -5x²) , тк степень отрицательная, то дробь переворачиваем
(28/5)^(28x²-5) =(28/5)^(127-5x²)
28x²-5 =127-5x²
28x²+5x² =127+5
33x² =132
x² =132/33
x² =4
x =+4
4.152 остальное решаем наподобие
(19/7)^(19x²-3) =(19/7)^(19-3x²)
19x² -3 =19-3x²
19x²+3x² =19+3
22x² =22
x² =1
x =+-1
4.153
(21/6)^(29x²-8x) =(21/6)^(29x-8x²)
29x²-8x =29x-8x²
29x²+8x² =29x+8x
37x² -37x =0
37x(x-1) =0
x =0; x-1=0; x =1