1.
=((С*(С+4)-С*(С-4)-С^2+16)\16-C^2):((4С+С^2)\(4-C^2)=(C^2+8C+16)\(16-C^2)*(4-C)^2\C(4+C)=(C+4)(C+4)\(4-C)(4+C)*(4+C)(4+C)\C(4+C)=(c+4)\(4-c)*(4+c)\c=(c+4)^2\c(4-c)
2.
=((2m(n+2m)-4m^2)|(n+2m)(n+2m):((2m-1(n+2m))\(n-2m)(n+2m)=2m^2\(n+2m)(n+2m)*(n-2m)(n+2m)\n=2m(n-2m)\n(n+2m)
3.
=2a(6a+7)\(2a+5)^2*(2a-5)(2a+5)\(6a+7)=2a(2a-5)\(2a+5)
1)(10a-25)\(2a+5)=5(2a-5)\(2a+5)
2)6a\(2a+5)-16a\(2a+5)(2a+5)=6a(2a+5)-16a)\(2a+5)(2a+5)=12a^2+14a)\(2a+5)^2=2a(6a+7)\(2a+5)^2