(5m+2n)В квадрате(ax-3)в квадрате(В+7)в квадрате(6х-0,1у)в квадрате2(с-3)в квадрате+6с7(х-2)+2(х+4)=5Упрогстить=3(х-у)-2(2х+1)

[latex] (a+b)^{2}=a^{2}+2ab+b^{2},(a-b)^{2}=a^{2}-2ab+b^{2}\\ (5m+2n)^{2}=25m^{2}+2*5m*2n+4n^{2}=25m^{2}+20mn+4n^{2} \\ (ax-3)^{2}=a^{2}x^{2}-6ax+9 \\ (b+7)^{2}=b^{2}+14b+49 \\ (6x-0.1y)^{2}=36x^{2}-2*6x*0.1y+0.01y^{2}=36x^{2}-1.2xy+0.01y^{2} \\ 2(c-3)^{2}+6c=2(c^{2}-6c+9)+6c=2c^{2}-12c+18+6c= \\ =2c^{2}-6c+18[/latex] [latex]7(x-2)+2(x+4)=5 \\ 7x-14+2x+8=5 \\ 9x=5+14-8 \\ 9x=11 \\ x= \frac{11}{9} \\ 3(x-y)-2(2x+1)=3x-3y-4x-2=-x-3y-2 [/latex]