Question

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Answer 1

3. (-6)•(-3)-(-7):2=18-(-3,5)=18+3,5=21,5

4.
$- \frac{3}{2} \times 5 \times ( - \frac{2}{3} ) \times \frac{1}{5} = \\ = ( - \frac{3}{2} \times ( - \frac{2}{3} ))(5 \times \frac{1}{5} ) = \\ = \frac{3 \times 2}{2 \times 3} \times \frac{5 \times 1}{5} = 1 \times 1 = 1$
5.
$( - 3.8) \times (1 \frac{7}{103}) \times (2x - 4.7) = 0 \\ 2x - 4.7 = 0 \\ 2x = 4.7 \\ x = 4. 7\div 2 \\ x = 2.35$
Ответ: 2,35.