Домножаем на 3 и 4:
9/12-4/12=5/12
<span>(x-2)(x+3)=х</span>²+3х-2х-6=х²+х-6<span>
(2x^2-y^2)(3y^2-x^2)=6х</span>²у²-2х∧4-3у∧4+х²у²<span>
(4x-3)(8x+6)=32х</span>²+24х-24х-18=32х²-18<span>
2y(y^2-1)(2+y)=2у(2у</span>²+у³-2-у)=4у³+2у∧4-4у-2у²
(6*2,2)+(1,8*6)-14=(13,2+10,8)-14=24-14=10
1) (х-у+m+n)*(x-y-m-n)
2) (2a-3c+4b+5a)*(2a-3c-4b-5a)=
=(7a+4b-3c)*(-3a-3c-4b)
3) (2a-2b+a+b)*(2a-2b-a-b)=
=(3a-b)*(a-3bL