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Fyyyyntik
@Fyyyyntik
August 2022
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Решите логарифмические уравнения, пожалуйста
1) log7(6-14x)=2
2) log0.6(-7x-5)=-1
3) lg(0,4x-6)=0
4) log2(x^2+4x+3)=3
5) lg(-3x-4)=lg(1-2x)
6) log3(x-2)+log3(6+x)=2
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Кулшат
1. 6-14x=49; -14x= 49+6; -14x= 55; x= - 55/14;
2. -7x - 5 = 5/3; -7x= 6 \frac{2}{3}; x = 20/3*1/7= 3/140;;
3. -3x-4=1; -3x = 5; x = -1 \frac{2}{3};
4. x²+4x+ 3 =8; x² +4x - 5=0; x= -5; x=1 отв: x=1;
5. -3x-4 =1-2x; -3x +2x =1+4; -x = 5; x=-5;
6. (x-2)(6+x ) =9; 6x+x² -2x -12-9 =0; x² +4x -21 =0; x= -7; x=3; отв: ч=3ю
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Answers & Comments
2. -7x - 5 = 5/3; -7x= 6 \frac{2}{3}; x = 20/3*1/7= 3/140;;
3. -3x-4=1; -3x = 5; x = -1 \frac{2}{3};
4. x²+4x+ 3 =8; x² +4x - 5=0; x= -5; x=1 отв: x=1;
5. -3x-4 =1-2x; -3x +2x =1+4; -x = 5; x=-5;
6. (x-2)(6+x ) =9; 6x+x² -2x -12-9 =0; x² +4x -21 =0; x= -7; x=3; отв: ч=3ю