Самостоятельная по алгебре 7 класс ​

Объяснение:

1) x²+2xy+y²-49=(x+y)²-7²=(x+y-7)(x+y+7)

2) a²-9b²+6bc-c²=a²-(3b-c)²=(a-3b+c)(a+3b-c)

3) a³+8-a²-2a=(a+2)(a²-2a+4)-a(a+2)=(a+2)(a²-2a+4-a)=(a²-3a+4)(a+2)

4) b⁶-4b⁴+12b²-9=b⁶-(2b²-3)²=(b³-2b²+3)(b³+2b²-3)

1) 6x³-24x=0; x²-4=0; x(x-2)(x+2)=0; x₁=0; x-2=0; x₂=2; x+2=0; x₃=-2

ответ: -2; 0 и 2.

2) 25x³-10x²+x=0; x(25x²-10x+1)=0; x₁=0

25x²-10x+1=0; D=100-100=0; x₂=10/50=1/5=0,2

ответ: 0 и 0,2.

3) x³+3x²-4x=0; x(x²+3x-4)=0; x₁=0

x²+3x-4=0

x₁+x₂=-3; -4+1=-3

x₁x₂=-4; -4·1=-4

x₁=-4; x₂=1

ответ: -4 и 1.

0 және не знаю как гOTBET:

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Write the correct preposition, then complete the

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OTBET:

the afternoon, learn work

in lunchtime, I eat pizza and drink juice

in night, I watch TV or play mobile games

in weekend, I go to picnicin

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in lunchtime, I eat pizza and drink juice

in night, I watch TV or play mobile games

in weekend, I go to picnicin

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the afternoon, learn work

in lunchtime, I eat pizza and drink juice

in night, I watch TV or play mobile games

in weekend, I go to picnicin

OTBET:

the afternoon, learn work

in lunchtime, I eat pizza and drink juice

in night, I watch TV or play mobile games

in weekend, I go to picnicin

OTBET:

the afternoon, learn work

in lunchtime, I eat pizza and drink juice

in night, I watch TV or play mobile games

in weekend, I go to picnicin

OTBET:

the afternoon, learn work

in lunchtime, I eat pizza and drink juice

in night, I watch TV or play mobile games

in weekend, I go to picnicin

OTBET:

the afternoon, learn work

in lunchtime, I eat pizza and drink juice

in night, I watch TV or play mobile games

in weekend, I go to picnicin

OTBET:

the afternoon, learn work

in lunchtime, I eat pizza and drink juice

in night, I watch TV or play mobile games

in weekend, I go to picnicin

OTBET:

the afternoon, learn work

in lunchtime, I eat pizza and drink juice

in night, I watch TV or play mobile games

in weekend, I go to picnicin

OTBET:

the afternoon, learn work

in lunchtime, I eat pizza and drink juice

in night, I watch TV or play mobile games

in weekend, I go to picnicin

OTBET:

the afternoon, learn work

in lunchtime, I eat pizza and drink juice

in night, I watch TV or play mobile games

in weekend, I go to picnicin

Write the correct preposition, then complete the

sentences for you.

Write the correct preposition, then complete the

sentences for you.

Write the correct preposition, then complete the

sentences for you.

Write the correct preposition, then complete the

sentences for you.

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a) х^2 + xy - x - ax + a - a = x^2+ xy - x - ax = x( x + y ) - x( 1 + a )

b) x^2 - 3x -x + 3 +3x -5 = x^2 - x - 2

                                              d = 1 + 4*2 = 9

                                        x_1 = (1 - 9) / 2 = -2 / 2 = -1

                                        x_2 = (1 + 3) / 2 = 4 / 2 = 2