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ybyfru
@ybyfru
August 2022
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решите уравнения
1)lg(7-x)=lg(x+4)+lg(x-7)
2)cons 3x=√3/2
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Identify
7-x=(x+4)(x-7)
7-x=x^2-7x+4x-28
x^2-2x-35=0
D=4-4*1*(-35)=12^2
x1=(2-12)/2=-5
x2=(2+12)/2=7
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Answers & Comments
7-x=x^2-7x+4x-28
x^2-2x-35=0
D=4-4*1*(-35)=12^2
x1=(2-12)/2=-5
x2=(2+12)/2=7