10a^2+a-7+2a-a^2-3a+3=9a^2-4=9*1/9-4=1-4=-3
Вложение ................................................
2x^3-7x^2+6x=0
x(2x^2-7x+6)=0
1)
2x^2-7x+6
D=49-48=1
x=3/2 , x=2
2)x(x-2)(2x-3)=0
x=0, x=2, x=3/2
0,009 = 9 * 10 ^ - 3
0,0000009 = 9 * 10 ^ - 7
----------------------------
( 9 * 10 ^ - 3 ) * ( 9 * 10 ^ - 7 ) = 81 * 10 ^ - 10
----------------------------------