[tex]266.[/tex]

[tex]1) \: \: \: \: \: {6bb}^{2} = {6b}^{3} [/tex]

[tex]2) \: \: \: \: \: 1.5 {c}^{3} {d}^{4} \times 8 {c}^{2} {d}^{6} = 12 {c}^{5} {d}^{10} [/tex]

[tex]3) \: \: \: \: \: - 0.8 {u}^{4} \times 4 {t}^{3} \times ( - 2 {t}^{7} ) = - 3.2 {u}^{4} {t}^{3} \times ( - 2 {t}^{7} ) = 6.4 {u}^{4} {t}^{10} [/tex]

[tex]4) \: \: \: \: \: 4.5 {a}^{2} bc {}^{7} \times 1 \frac{1}{9} {a}^{8} {b}^{6} c = \frac{45}{10} {a}^{2} {bc}^{7} \times \frac{10}{9} {a}^{8} {b}^{6} c = 5 {a}^{10} {b}^{7} {c}^{8} [/tex]

[tex] \\ [/tex]

[tex]270.[/tex]

[tex]1) \: \: \: \: \: {12a}^{2} \times 5 {a}^{3} {b}^{7} = 60 {a}^{5} {b}^{7} [/tex]

[tex]2) \: \: \: \: \: - 4 {m}^{3} \times 0.25 {m}^{6} = - {m}^{9} [/tex]

[tex]3) \: \: \: \: \: 3ab \times ( - 17 {a}^{2} b) = - 51 {a}^{3} {b}^{2} [/tex]

[tex]4) \: \: \: \: \: 56 {x}^{5} {y}^{14} \times \frac{2}{7} {x}^{2} y = 16 {x}^{7} {y}^{15} \\ [/tex]

[tex]5) \: \: \: \: \: - \frac{1}{3} {p}^{2} \times ( - 27k) \times 5pk = 9 {p}^{2} k \times 5pk = 45 {p}^{3} {k}^{2} [/tex]

[tex]6) \: \: \: \: \: 2 \frac{1}{4} {b}^{2} {c}^{6} {d}^{8} \times ( - 3 \frac{1}{3} {b}^{8} {c}^{4} {d}^{7} ) = \frac{9}{4} {b}^{2} {c}^{6} {d}^{8} \times ( - \frac{10}{9} {b}^{8} {c}^{4} {d}^{7} ) = - 2.5 {b}^{10} {c}^{10} {d}^{15} [/tex]