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1)9y²-(y-2)²=9y²-(y²-4y+4)=9y²-y²+4y-4=8y²+4y-4
2)8+64x³=(2+4x)(4-8x+16x²)
1 c
2 a
3 e
4 d
5 b
вот так вот
2xyz - 3x²z²+4xy³z=xz(2y-3xz+4y³)
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{ x/2 - y/3 = 14
{ x = 54 - 3/2y
{ 54 - 3/2y/2 - y/3 = 14
y = 12
x = 54 - 3/2 * 12
x = 36
{ 36/2 - 12/3 = 14
{ 36/18 + 12/12 = 3
{ 14 = 14
{ 3 = 3
(x, y) = (36, 12)