0, 15(3) = х
153,(3) = 1000х
15,(3) = 100х
1000х - 100х = 138
900х = 138
х = 138/900.
(1+3x)+(x^2-2x)-(2x^2-x) = 1+3x + x^2-2x - 2x^2+x = -x^2+2x+1 = x^2-2x-1
<span>а) -3ав^2*5а^3*6в^3=-90a^4b^6
б) (-3*а^2*в^5)^3
=-27a^6b^15</span>
А)=9б^2+6аб+а^2
б)= t^4-16b^2
8x+6-(7x+4)=5
x+2=5
x=5-2
<span>x=3</span>