1.
√8*√6*√3 -7=
√2*√4*√2*√3*√3 -7=
2*2*3-7=
12-7=5
2. Г
5х+10/х-5 : 3х+6/х²-25=
5(х+2)/х-5 : 3(х+2)/(х-5)(х+5)=
5(х+2)/х-5 * (х-5)(х+5)/ 3(х+2)=
5(х-5)/3
3.
2х²-3х+1=0
D=9-8=1
x1=3+1/2=4/2=2
x2=3-1/2=2/2=1
4.
2x-1/3 < 4x-5/5
5(2x-1) < 3(4x-5)
10x-5 < 12x-15
15-5 < 12x-10x
2x > 10
x > 5
5.
6x + 2/x =7
6x²+2 / x=7
6x²+2=7x
6x²+2-7x=0
D=49-4*6*2=49-48=1
x1=7+1/12=8/12=2/3
x2=7-1/12=6/12=1/2