Ответ:
1)(m+4)²=m²+2m×4+4²=m+8m+16
2)(х+у)²=x²+2xy+y²
3)(а-3)²=а²-2а×3+3²=а²-6а+9
4)(2х-у)²=(2х)²-2×2х×у+у²=4х²-4ху+у²
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Ответ:
1)(m+4)²=m²+2m×4+4²=m+8m+16
2)(х+у)²=x²+2xy+y²
3)(а-3)²=а²-2а×3+3²=а²-6а+9
4)(2х-у)²=(2х)²-2×2х×у+у²=4х²-4ху+у²