<span>25-(4m-5)^2=</span>25+16m^2+40m-25=16m^2+40m
<span>(-7k+1)^2+14k=</span>49k^2-14k+1+14k=49k^2+1
<span> (8+7y)^2-49y^2-60=</span>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)
Прости, немного качество плохое
10 11 12 13 14 15 16 17 18 19 20
0 1 2 3 4 0 1 2 2 4 0