это решить столбиком ​...

Вот так надо делать

1)3х^2=0
Х=0
2)9х^2=81
Х^2=9
Х=+-3
3)3х^2=27
Х=9
Х=+-3
4)0,01х^2=4
Х^2=400
Х=+-20
Решить уравнения
1)Х^2+5х=0
Х(х+5)=0
Х=0
Х=-5
2)4х^2=0,16х
4х(х-0,04)=0
4х=0---х=0
Х=0,04
3)9х^2+1=0
9х^2=-1
Х=-V1/9 ( корень)
Решить уравнения. 3
1)4х^2-169=0
Х^2=42,25
Х=+ -6,5
2)25-16x^2=0
-16x^2=-25
X^2=25/16
X=+ -5/4(1,25)
3)2х^2-16=0
Х^2=8
Х=+ - корень из 8
4)3х^2=15
Х= + - корень из 5
5)2х^2=1/8
Х^2=1/16
Х=+ -1/4
6)3х^2=5.1/3
Х^2=16/9
Х=+ -4/3

My sister's son is a student. he studies well at school. he doesn't get bad marks, as a rule. my sister usually helps him to do lessons. i haven't got a sister, but i have four brothers. two of them finished studying at university last year, and another two of them studying at school. this young woman is a engeneer. she works at a big factory. she has a lots work. every morning she takes her little son to kindergarden. klimov is an old worker. he hasn't grandson, but he has two granddaughters. one of them was born seven years ago, and another one was born last year.