Укажите верные равенства:
1) (2a+b)2 = 4a2+b2+4ab
2) (2a-b)2 = 4a2+b2+2ab
3) (x-y)(x+y) = x2 - y2
4) (y - 3x)(3x+y) = 9x2 - y2
1) (2a+b)2 = 4a2+b2+4ab
2) (2a-b)2 = 4a2+b2+2ab
3) (x-y)(x+y) = x2 - y2
4) (y - 3x)(3x+y) = 9x2 - y2
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Answers & Comments
1) верно
2) не верно
3) верно
4)не верно