Решите уравнение (5a +2) (5a-2) -5a(5a-1)=21 3(y+2)kv - вопрос №5252551213221733282823311 от mihailodnowal777 02.11.2022 03:16

Question

Алгебра: Решите уравнение (5a +2) (5a-2) -5a(5a-1)=21 3(y+2)kv +(2y-1)kv -7(y+3) (y-3)=28

mihailodnowal777 · Answer

1)(5a +2) (5a-2) -5a(5a-1)=211)25a²-4-25a²+5a=215a=25a=5 2)3(y+2)kv +(2y-1)kv -7(y+3) (y-3)=28a)kv=0-7(y+3) (y-3)=28y²-9=-4y²=5⇒y=-√5  y=√5kv≠03kvy+6kv+2kvy-kv-7y²+63-28=07y²+5kvy+35+kv=0D=25k²v²-27(35+kv)=25k²v²-27kv-9451)25k²v²-27kv-945 0=нет решения2)25k²v²-27kv-945=0y=-5kv/143)25k²v²-27kv-945 0y1=(-5kv-√(25k²v²-27kv-945))/14y2=(-5kv+√(25k²v²-27kv-945))/14...