[tex]1)x {y}^{3} - {y}^{3} - {y}^{4} + {xy}^{4} \\ {y}^{3} \times (x - 1 - y + xy) \\ {y}^{3} \times (x - 1 + y \times ( - 1 + x)) \\ {y}^{3} \times ( - 1 + x)(1 + y)[/tex]
[tex](5x - 1)(5x + 1) - 5x(5x + 2) = \\ 25 {x}^{2} - 1 - 25 {x}^{2} - 10x \\ - 1 - 10x \times 0.2 \\ - 1 - (10 \times 0.2)x \\ - 1 - 2x[/tex]
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[tex]1)x {y}^{3} - {y}^{3} - {y}^{4} + {xy}^{4} \\ {y}^{3} \times (x - 1 - y + xy) \\ {y}^{3} \times (x - 1 + y \times ( - 1 + x)) \\ {y}^{3} \times ( - 1 + x)(1 + y)[/tex]
Ответ: у³×(-1+х)(1+у) [✓]
2) при х=0.2
[tex](5x - 1)(5x + 1) - 5x(5x + 2) = \\ 25 {x}^{2} - 1 - 25 {x}^{2} - 10x \\ - 1 - 10x \times 0.2 \\ - 1 - (10 \times 0.2)x \\ - 1 - 2x[/tex]
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