Question

pomocy na dzisiaj dam wszystkie punkty a

Answer 1

1.

8a^3-4^2+2,dla a=-1/4; ^ potęga

8*(-1/4)^3-4*(-1/4)^2+2=8*(-1/64)-4*1/16+2=-1/8+1/4+2=-1/8+2/8+2=2 1/8

2.

{[(x-4)*3+1/2x]*2}:5={[3x-12+1/2x]*2}:5={[2,5x-12]*2}:5={5x-24}:5=x-4,8

3.

10a^2b+(-2 1/2a^2b+1/2ab^2)-(7,5a^b-ab^2)=

10a^2b-2,5a^2b+1/2ab^2-7,5a^b+ab^2=1 1/2ab^2

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4.

12x(0,5x^2-1/4y)-15y(-1/3x+0,2y^2)-2xy=6x^3-3xy-5xy-3y^3-2xy=6x^3-10xy-3y^3

5.

9ab^2+15a^2b-3ab=3ab(3b+5a-1)

6.

(3-2y)(3+2y)+(2y-3)^2=9-4y^2+4y^2-12y+9=18-12y

7.

Obwód prostokąta O=2x+2(x+y)=2x+2x+2y=4x+2y

obwód kwadratu O=4a

4a=4x+2y/4

a=x+1/2y

P= a^2

P=(x+1/2y)^2=x^2+xy+1/4y^2- pole kwadratu

8.

(2n+7)^2+(2n+8)^2+(2n+9)^2=

4n^2+28n+49+4n^2+32n+64+4n^2+36n+81=12n^2+96n+194