1. Рассмотрите уравнения:
1) 2(х-4)+6=8;
2) 7х2 -6х+2=0;
3) х4-18х2+81=0;
4) х4-10х2+9=0
5) (3х2+4х)4+(3х2+4х)2-8=0
1) 2(х-4)+6=8;
2) 7х2 -6х+2=0;
3) х4-18х2+81=0;
4) х4-10х2+9=0
5) (3х2+4х)4+(3х2+4х)2-8=0
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Ответ:
1)2(х-4)+6=8
2х-8+6=8
2х-2=8
2х=8+2
2х=10
х=5
2)7х2-6х+2=0
14х-6х+2=0
8х+2=0
8х=-2
4х=-1
3)х4-18х2+81=0
4х-36х+81=0
-32х+81=0
-32х=-81
32х=81
4)х4-10х2+9=0
4х-20х+9=0
-16х+9=0
-16х=-9
16х=9
5)(3х2+4х)4+(3х2+4х)2-8=0
(6х+4х)×4+(6х+4х)×2-8=0
10х×4+10х×2-8=0
40х+20х-8=0
60х-8=0
60х=8
х=2/15