14+21+28+35+42+49+56+63+70+77+84+91+98=735
<span>(а^2+b^3) (a^4-2a^2b^3+4b^6)=
=a^6-2a^4b^3+4a^2b^6+a^4b^3-2a^2b^6+4b^9=
=a^6-a^4b^3+2a^2b^6+4b^9
а если там двойка, то:
</span><span>(а^2+2b^3) (a^4-2a^2b^3+4b^6)=
</span>
=a^6-2a^4b^3+4a^2b^6+2a^4b^3-4a^2b^6+8b^9=
=a^6+8b^9
1.а)-х-2ху+7
б)6а^6-12а^3
в)6у^2-с^2-ус
г)х^3-2х^2-7х-4
д)4а+1
(4x-3)*3 - 2x = 18
12x - 9 - 2x = 18
10x = 27
x = 27/10
x = 2,7