Question

Помогите пожалуйста!
Вариант А2

Answer 1

Ответ:

решение смотри на фотографии

Объяснение:

Answer 2

9838482929

Ответ:

Объяснение:

a) 4x/(x+1) -(x-3) /(x+1) =( (4x -(x-3) ) /(x+1)= (4x -x+3)/(x+1) =(3x+3)/(x+1)=

=3(x+1)/(x+1) =3 .

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б) (2-x) /(4-y²) - (x+y) /(y²-4) =(2-x) /(4-y²) - (x+y)/ (-(4 -y²)) =

(2-x) /(4-y²) +(x+y)/ (4 -y²)) =(2-x +x+y) /(4 -y²)  =(2+y) /(2² -y²)

(2+y) /(2+y) (2-y) = 1/(2-y).

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а) (a-b)/a²+(a-b)/ab =( (a-b)b+(a-b)a ) / a²b = (ab-b²+a² -ab) /a²b=

(a²-b²) /a²b .

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б) 2x+2x²/(1-x) =(2x(1-x) +2x² )/(1-x) ==(2x-2x² +2x² )/ (1-x) =2x / (1-x) .

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9/(3y+6) + (y²-3y+2)/(y²- 4) =9/3(y+2) + (y²-3y+2)/(y-2) (y+2) =

3/(y+2) + (y²-3y+2)/(y-2) (y+2)=(3(y-2) +(y²-3y+2) )/(y-2)(y+2)=

=(3y - 6 + y²-3y +2) )/(y-2) (y+2)=(y² 4)/(y-2) (y+2)=(y²- 4)/(y²- 4) = 1.