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svetlanapro2000
@svetlanapro2000
August 2022
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ПОМОГИТЕ ПОЖАЛУЙСТА! РЕШИТЬ УРАВНЕНИЯ!
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uekmyfhfp
1. 5* 2^(x-2) + 3*2^(x+1) = 29;
5*2^(x-2) +_ 3 *2^3 * 2^(x-2) = 29;
5*2^(x-2) + 24 * 5^(x-2) = 29;
29*5^(x-2) = 29;
5^(x-2) = 1;
5^(x-2) = 5^0;
x-2 = 0;
x = 2 .
2.
2 * 3^(x+1) - 6 * 3^(x-1) - 3^x = 9;
2* 3^2 * 3^(x-1) - 6 * 3^(x-1) - 3 * 3^(x-1) = 9;
18*3^(x-1) - 6 * 4^(x-1) - 3*3^(x-1) = 9;
9*9^(x-1) = 9;
9^(x-1) = 1;
9^(x-1) = 9^0;
x-1 = 0;
x = 1.
3. 3^(x+1) + 5 * 3^x - 3 * 3^(x-1) = 21;
3^2 * 3^(x-1) + 5 * 3 * 3^(x-1) - 3* 3^(x-1) = 21;
9*3^(x-1) + 15 * 3^(x-1) - 3 * 3^(x-1) = 21;
21 * 3^(x-1) = 21;
3^(x-1) = 1;
3^(x-1) = 3^0;
x - 1 = 0;
x = 1
1 votes
Thanks 1
svetlanapro2000
огромное спасибо!!!
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Answers & Comments
5*2^(x-2) +_ 3 *2^3 * 2^(x-2) = 29;
5*2^(x-2) + 24 * 5^(x-2) = 29;
29*5^(x-2) = 29;
5^(x-2) = 1;
5^(x-2) = 5^0;
x-2 = 0;
x = 2 .
2.
2 * 3^(x+1) - 6 * 3^(x-1) - 3^x = 9;
2* 3^2 * 3^(x-1) - 6 * 3^(x-1) - 3 * 3^(x-1) = 9;
18*3^(x-1) - 6 * 4^(x-1) - 3*3^(x-1) = 9;
9*9^(x-1) = 9;
9^(x-1) = 1;
9^(x-1) = 9^0;
x-1 = 0;
x = 1.
3. 3^(x+1) + 5 * 3^x - 3 * 3^(x-1) = 21;
3^2 * 3^(x-1) + 5 * 3 * 3^(x-1) - 3* 3^(x-1) = 21;
9*3^(x-1) + 15 * 3^(x-1) - 3 * 3^(x-1) = 21;
21 * 3^(x-1) = 21;
3^(x-1) = 1;
3^(x-1) = 3^0;
x - 1 = 0;
x = 1