-0,2у-0,2х+0,11
Вроде так=)
a^2+b^2+c^2+2ac-2ab-2bc...........................................
1)
12x² + 12y - 16x - 9xy = 3x(4x - 3y) - 4(4x - 3y) = (4x - 3y)(3x - 4)
2)
-15a² - 60ab + 48b - 36mn = -3(5a² + 12ab -16b +12mn)
<span>-15(4y-3)+37y=42y-111</span>
<span>-60у+45+37у=42у-111</span>
<span>-23у-42у=-111-45</span>
<span>-65у=-156</span>
<span>у=-156:(-65)</span>
<span>у=2,4</span>
А)(n+1)(2n-3)+(n-1)(3n+1)=2n²-3n+2n-3+3n²+n-3n-1=5n²-3n-4
б)(x-y)(2x-3y)-(3x-y)(2x+y)=2x²-3yx-2xy+3y²-6x²+3xy-2xy-y²=-4x²-4xy+2y²
в)(2a+3)(2a+3)-(2a+1)(2a-1)=4a²+6a+6a+9-4a²-2a+2a-1=12a-8
г)(3c-d)(d+3c)+(4c-d)(c-4d)=3cd+9c²-d²-3cd+4c²-16cd-cd+4d²=13c²+3d²-17cd