Question

Кто выполнит дам 60 баллов, достойное вознаграждение! Надо сделать №17,№19,№22,№24!

Answer 1

17
...=9(x+2y)²/5(x+2y)=9(x+2y)/5
19
...=ab³/7(1-p)*(1-p)²/a²b²=b(1-p)/7a
22
...=(x+1)/x(x-1)-(x+2)/(x-1)(x+1)=(x²+2x+1-x²-2x)/x(x²-1)=1/x(x²-1)
24
...=(x²-3xy)/(x-y)(x+y)+y/(x-y)=(x²-3xy+xy+y²)/(x²-y²)=(x²-2xy+y²)/(x²-y²)=(x-y)²/(x-y)(x+y)=
=(x-y)/(x+y)