Question

Раскройте скобки:
1.(х+2у)².
2.(2а-3)²
3.(3х-5у²)(3х+5у²)
4.(а+2)(а²-2а+4)
5.(х-1)(х²+х+1)

Answer 1

1)(x+2y)²=x²+4xy+4y²
2)(2a-3)²=4a²-12a+9
3)(3x-5y²)(3x+5y²)=9x²-25yˇ4
4)(a+2)(a²-2a+4)=a³+2³=a³+8
5)(x-1)(x²+x+1)=x³-1³=x³-1