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Образование-и-коммуникации
daeinam095
daeinam095
07.07.2021 05:40 •  Алгебра

Решите уравнение 1) 3 (x*2-2)-3x+7-3 (x*2-2x)=0 . 2)-(x*2-2)-0.3x+7x+(x*2-0.2x)=0

👇
Ответ:
annamacsimava08
annamacsimava08
07.07.2021

1)

3(x^{2} -2)-3x+7-3(x^{2} -2x)=0\\3x^{2} -6-3x+7-3x^{2} +6x=0\\3x+1=0\\x = -\frac{1}{3} \\

2)

-(x^{2} -2)-0.3x+7x+(x^{2} -0.2x)=0\\-x^{2} +2-0.3x+7x+x^{2} -0.2x=0\\6.5x+2=0\\x=-\frac{2}{6.5} =-\frac{4}{13} \\

4,8(32 оценок)
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Ответ:
ilyailushin
ilyailushin
07.07.2021

at our lessons we answer the teacher's questions.

in england they don't go to school every day.

i do my homework in my bedroom.

the pupils on duty tidy the classroom.

all the pupils have to wear uniforms.

i come to school at a quarter to eight.

we like to make reports.

 

i do me homework every day.

i have my music lessons two times a week.

we have english three times a week.

this magazine is published to times a month.

i visit my aunt three times a month.

i never miss classes.

i go to the forest very often.

they seldom go to the theatre.

4,4(40 оценок)
Ответ:
chiminswife
chiminswife
07.07.2021

 

i don't want to answer the teacher's questions.

my friends and i  go to school every day.

i do my homework at school.

every friday the students tidy their classrooms.

we don't have to wear a uniform  at our school.

as a rule they  come to school at 8 a.m.

my sister like to make reports on geography.

 

we must do washing up every day.

i have to play chess two times a week.

we go to a swimming pool three times a week.

my mother goes to the dentist two times a month.

i go to the disco three times a month.

i have never been to volgograd.

she goes to the cinema very often.

they seldom sing and dance.

4,5(33 оценок)
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