1.а)10^2*10^5=10^7;
б) 7^6÷7^2=7^4;
в)(а^5)3=а^15;
г)2^8*3^8=(2*3)^8=6^8;
2. (2а^2в-3ав^2+в^2)-(а^2в-2ав^2+2в)=
а^2в-ав^2+в^2-2в;
3.а) (-0,5х^2у^3z^5)*(-4xy^2z^2)=
2x^3y^5z^7;
b)(1/3a+6b)(6b-1/3a)=(6b)^2-(1/3a)^2=
36b-1/9a;
4.A+B=(5,5x^3y-2xy^2)+(0,5x^3y-2xy^2)=
6x^3y-4xy^2=6*(-1/2)^3*2-4(-1/2)*2^2=
-3/2-8=-1,5-8=-9,5;
A-B=(5,5x^3y-2xy^2)-(0,5x^3y-2xy^2)=
5x^3y=5*(-1/2)^3*2=-10*1/8=-5/4=-1,25.
5)решение
х^2+х-2х-2-х^2-2х+х+2+0,2=0;
-2х+0,2=0;
2х=0,2;
х=0,2÷2;
х=0,1.