Question

holaaa me ayudarian a saber los pasos de este calculo?
como hago esto, como cancelo el 4 etc

Answer 1

Respuesta:

4) $6$

5) $\frac{11}{10}$

Explicación paso a paso:

4)

$\left(1-\frac{\:8}{\:10}\cdot \frac{1}{4}\right)\cdot \frac{15}{2}=\left(1-\frac{4}{5}\cdot \frac{1}{4}\right)\frac{15}{2}=\left(1-\frac{\:4}{20}\right)\cdot \frac{15}{2}=\left(1-\:\frac{1}{5}\right)\cdot \frac{15}{2}=\left(\frac{5\left(1\right)-1}{5}\right)\cdot \frac{15}{2}=\left\frac{4}{5}\right\cdot \frac{15}{2}=\frac{60}{10}=6$

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5)

$\frac{4}{5}-\frac{\:12}{\:10}\div \frac{20}{5}+\frac{6}{10}= \frac{4}{5}-\frac{12}{10}\times \frac{5}{20}+\frac{6}{10} = \frac{4}{5}-\frac{6}{5}\times \:\frac{1}{4}+\frac{6}{10}= \:\frac{4}{5}-\frac{6}{20}+\frac{6}{10} = \:\frac{16}{20}-\frac{6}{20}+\frac{12}{20}\: = \frac{\left(16-6+12\right)}{20} = \frac{22}{20} = \frac{11}{10}$