Question

__________решите плз_________

Answer 1

Объяснение:

4.

$0.77 {x}^{ - 25} {y}^{6} = \frac{77}{100} \times \frac{1}{ {x}^{25} } \times {y}^{6} = \frac{77 {y}^{6} }{100 {x}^{25} }$

5. 1)

$\frac{1}{ {1}^{2} } + \frac{7}{12} = \frac{1}{4} + \frac{7}{12} = \frac{5}{6}$

2)

$\frac{ {14}^{ - 18} }{ {14}^{ - 17} } = \frac{1}{14}$

6.

$- ( \frac{5}{6} {a}^{ - 9} {b}^{ - 5} ) \times {6}^{ - 2} {a}^{ - 30} {b}^{ - 12} = - {5}^{ - 3} {a}^{27} {b}^{15} \times 6^{ - 30} {b}^{ - 12} = - \frac{1}{ {5}^{3} } \times {a}^{27} {b}^{15} \times 6 {a}^{ - 30} {b}^{ - 12} = - \frac{6}{125} {a}^{ - 3} {b}^{3} = - \frac{6}{125} \times \frac{1}{ {a}^{3} } \times {b}^{3} = - \frac{6 {b}^{3} }{125 {a}^{3} }$

7. 1)

${2}^{ - 16} \times {16}^{3} = {2}^{ - 16} \times {2}^{12} = {2}^{ - 4} = \frac{1}{16}$

2)

$\frac{ {3}^{ - 12} - {3}^{ - 15} }{ {9}^{ - 12} } = {3}^{12} - {3}^{9} = ( {3}^{3} - 1) \times {3}^{9} = (27 - 1) \times 19683 = 511758$