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2 years ago

Simplify:- ~~~~~~~

Mathematics

2 answers:

Alchen [17]2 years ago

7 0

$\sf \dashrightarrow \: - \frac{2}{5} - ( - \frac{3}{10} ) - ( - \frac{4}{7} )$

When there is a - in front of an expression in parentheses, change the sign of each term in the expression to +

$\sf \dashrightarrow \: - \frac{2}{5} + \frac{3}{10} + \frac{4}{7}$

Calculate the LCM of denominators

$\sf\frac{ - 28 + 21 + 40}{70}$

Calculate the difference

$\bf \underline{ \underline \frac{33}{70} }$

denpristay [2]2 years ago

6 0

$\\ \rm\rightarrowtail \dfrac{-2}{5}-\left(-\dfrac{3}{10}\right)-\left(-\dfrac{4}{7}\right)$

(-)(-)=(+)

$\\ \rm\rightarrowtail \dfrac{-2}{5}+\dfrac{3}{10}+\dfrac{4}{7}$

$\\ \rm\rightarrowtail \dfrac{-28+21+40}{70}$

$\\ \rm\rightarrowtail \dfrac{-7+40}{70}$

$\\ \rm\rightarrowtail \dfrac{33}{70}$

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The length of the rectangle is 20 inches, the triangular piece divides this length into three segments, two of which measure 8 inches and the third one is of unknown length.

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