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Объяснение:

[tex]1.1)3a \times ( - 2ac) = - 6 {a}^{2} c \\ 2)p \times ( - q) \times {p}^{20} = - {p}^{21} q \\ 3) - 4 {x}^{3 } \times 0.1 {x}^{3} y \times ( - 2.5y) = - 0.4 {x}^{6} y \times ( - 2 .5y) = 1 {x}^{6} y[/tex]

[tex] - 3.2 {a}^{2} {b}^{3} = - 3.2 \times ( \frac{1}{2} {)}^{2} \times ( - 1 {)}^{3} = - 3.2 \times \frac{1}{4} \times ( - 1) = 3.2 \times \frac{1}{4} = 3 \frac{2}{10} \times \frac{1}{4} = 3 \frac{1}{5} \times \frac{1}{4} = \frac{16}{5} \times \frac{1}{4} = \frac{16}{20} = \frac{4}{5} [/tex]

[tex]3.1)5 {a}^{6} \times ( - 3 {a}^{2} b) {}^{2} = 5 {a}^{6} \times 9 {a}^{4} {b}^{2} = 45 {a}^{10} {b}^{2} \\ 2)( - {x}^{4} {y}^{3} ) {}^{7} \times 8 {x}^{2} {y}^{5} = - {x}^{28} {y}^{21} \times 8 {x}^{2} {y}^{5} = - 8 {x}^{30} {y}^{26} [/tex]

[tex]4.1) {x}^{2} + 4x - 5 + {x}^{2} - 3x + 2 = 2 {x}^{2} + x - 3 \\ 2)4 {a}^{2} b - 3a {b}^{2} - {a}^{2} b + 2a {b}^{2} = 3 {a}^{2} b - a {b}^{2} [/tex]