Question

ajutor, e urgent, timp pana luni, dau coroana​

Answer 1

rad7^2=7  rad(-10)^2=-10

rad9^2=9  rad(-16)^2=-16

rad15^2=15  rad(-30)^2=-30

rad20^2=20  rad(-45)^2=-45

a. 1+2+...+8=36,este patrat perfet

b.11+12+...+16=81 este patrat perfect

c.9^2+12^2=81+144=225,este patrat perfect

d.7^2+24^2=49+576=625,este patrat perfect