展开-(5(sqrt(813)-15))/(49)

解答

展开

- \frac{5 ( 813 - 15 )}{49}

- \frac{5 813}{49} + \frac{75}{49}

十进制

- 1.37889 \dots

求解步骤

- \frac{5 ( 813 - 15 )}{49}

乘开

5 (813 - 15) : 5813 - 75

= - \frac{5 813 - 75}{49}

使用分式法则:

\frac{a \pm b}{c} = \frac{a}{c} \pm \frac{b}{c}

\frac{5 813 - 75}{49} = - (\frac{5 813}{49}) - (- \frac{75}{49})

= - (\frac{5 813}{49}) - (- \frac{75}{49})

去除括号:

(a) = a, - (- a) = a

= - \frac{5 813}{49} + \frac{75}{49}

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