25-(4m-5)^2=25+16m^2+40m-25=16m^2+40m
(-7k+1)^2+14k=49k^2-14k+1+14k=49k^2+1
(8+7y)^2-49y^2-60=64+112y+49y^2-49y^2-60=4+112y
A) 25-16m^2+40m-25
40m-16m^2=16m(2.5-m)
Б)1-14k+49k^2+14k
1+49k^2
В)64+112y+49y^2-49y^2-60
4+112y=4(1+28y)
25-(4m-5)^2=25+16m^2+40m-25=16m^2+40m
(-7k+1)^2+14k=49k^2-14k+1+14k=49k^2+1
(8+7y)^2-49y^2-60=64+112y+49y^2-49y^2-60=4+112y
A) 25-16m^2+40m-25
40m-16m^2=16m(2.5-m)
Б)1-14k+49k^2+14k
1+49k^2
В)64+112y+49y^2-49y^2-60
4+112y=4(1+28y)