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(1-b)²=1-2b+b²
(20-3)²=400-120+9= 289
(x-5y)²=x²-10xy+25y²
(a-7x)²=a²-14ax+49x²
(3-bc)²=9-6bc+b²c²
(10-6c)²=100-120c+36c²
(8a-4y)²=64a²-64ay+16y²
(2x-5)²=4x²-10x+25
(4a-9y)²=16a²-72ay+81y²
(1-5a)²=1-10a+25a
(9y-4)²=81y²-72y+16
(3a-9y)²=9a²-54ay+81y²
(8x-2a)²=64x²-32ax+4a²
(a-5)²=a²-10a+25
(13-a)²=169-26a+a²
(5y-6b)²=25y²-60by+36b²
(2c-7a)²=2c²-28ac+49a²
(4a=6b)²=16a²-48ab+36b²
a²-2ab+b²a²- ab + b²
chyba coś jest źle?!