помогите с работой!
10 балов пж

1.

a) 5^2*5^3=5^5

b)8^8:8^3=8^(8-3)=8^5

w)(b^4)^5=b^20

g)3^7*4*7=(3*4)^7

2.

(3x^3y-4xy^2-2y)-(2x^3y+6xy^2-y)=

=3x^3y-4xy^-2y-2x^3y-6xy^2+y=

=x^3y-10xy^2-y

3.

A(2a^2b^3c)*(-3,5a^3bc^3)=

=-7a^5b^4c^4

b)  (Sn-1/4p)(1/4p+Sn)=

=(Sn-1/4p)(Sn+1/4p)=

=(Sn)^2 – 1/16p^2

4.

A=-2x^3y-1,5xy^2

A=-2(1,5)^3*(-2) – 1,5(1,5)*(-2)^2

A=4*3,375-2,25*4

A=4(3,375-2,25)

A=4*1,125

A=4,5

B=-0,4x^3y+1,5xy^2

B=-0,4(1,5^3*(-2)+1,5(1,5)*(-2)^2

B=-0,4*3,375*(-2)+2,25*4

B=-1,35*(-2)+9

B=2,7+9

B=11,7

5.

2(x+3)(x-2)-(2x+1)(x-3)-7=0

2x^2-4x+6x-12-(2x^2-6x+x-3)-7

2x^2+2x-19-2x^2+6x-x+3=0

7x-16=0

7x=16 // : 7