Question

add the following 3 by 8 plus minus 5 by 7
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Answer 1

Answer:

21/56 + 40/56 = 61/56

Step-by-step explanation:

LCM of 7 and 8 is 56...

So, 3×7/8×7 + 5×8/7×8 = 21/56 + 40/56 = 61/56

Answer 2

$= ( \frac{3}{8} ) + ( - \frac{5}{7} ) \\ = \frac{3}{8} - \frac{5}{7} \\ = \frac{21 - 40}{56} \\ = - \frac{19}{56} ans.$