(2у-1)²=(2y)²-2×2y×1+1²=4y-4y+1
(4-x)²=16-8x+x²= x²-8x+16
(5-x)²=25-10х+х²= х²-10х+25
(8x-1)²=8x²-2×8×1+1²=64x²-16x+1
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(2у-1)²=(2y)²-2×2y×1+1²=4y-4y+1
(4-x)²=16-8x+x²= x²-8x+16
(5-x)²=25-10х+х²= х²-10х+25
(8x-1)²=8x²-2×8×1+1²=64x²-16x+1