Формулы:
(a±b)²=a²±2ab+b²
a²-b²=(a-b)(a+b)
1.
(x+3y)(3y-x)=(3у+х)(3у-х)=(3у)²-х²=9у²-х²
2.
(2y+x)²=(2у)²•2•2у•х+х²=4у²+4ху+х²
3.
(y-2x)²=у²-2•2х•у+(2х)³=у²-4ху+4х²
4.
(3y-x)²=(3у)²-2•3у•х+х²=9у²-6ху+х³
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Answers & Comments
Формулы:
(a±b)²=a²±2ab+b²
a²-b²=(a-b)(a+b)
1.
(x+3y)(3y-x)=(3у+х)(3у-х)=(3у)²-х²=9у²-х²
2.
(2y+x)²=(2у)²•2•2у•х+х²=4у²+4ху+х²
3.
(y-2x)²=у²-2•2х•у+(2х)³=у²-4ху+4х²
4.
(3y-x)²=(3у)²-2•3у•х+х²=9у²-6ху+х³