w zalaczniku sa zadanka prosze o rozwiazanie :)
1)
a)4/x+3=1
4=x+3
x=1
b)3x-1/9-5x=1/2
6x-2/9-5x=1
6x-2=9-5x
11x=11
c)3/x-7=2/x-8
3(x-8)=2(x-7)
3x-24=2x-14
x=-14+24=10
d)x/x+2=2x/x-2
x(x-2)=2x(x+2)
x^2-2x=2x^2+4x
x^2=-6x
x=-6
2)
a)an =4n-n^2
4n-n^2<4(n+1)-(n+1)^2
4n-n^2<4n+4-n^2-2n-1
4n - n^2 < -n^2+2n+3
4n<2n+3
2n<3
cia jest malejący
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1)
a)4/x+3=1
4=x+3
x=1
b)3x-1/9-5x=1/2
6x-2/9-5x=1
6x-2=9-5x
11x=11
x=1
c)3/x-7=2/x-8
3(x-8)=2(x-7)
3x-24=2x-14
x=-14+24=10
d)x/x+2=2x/x-2
x(x-2)=2x(x+2)
x^2-2x=2x^2+4x
x^2=-6x
x=-6
2)
a)an =4n-n^2
4n-n^2<4(n+1)-(n+1)^2
4n-n^2<4n+4-n^2-2n-1
4n - n^2 < -n^2+2n+3
4n<2n+3
2n<3
cia jest malejący