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Find 3/7 plus 6/-11 plus -8/21 plus 5/22

1 Answer

1 vote

To find the sum of fractions, we need to have a common denominator. In this case, the common denominator is 7 * (-11) * 21 * 22 = -230,514.

Now we can add the fractions:


\displaystyle (3)/(7) + (6)/(-11) + (-8)/(21) + (5)/(22) = (3 \cdot (-11) \cdot 21 \cdot 22)/(7 \cdot (-11) \cdot 21 \cdot 22) + (6 \cdot 7 \cdot (-21) \cdot 22)/(-11 \cdot 7 \cdot (-21) \cdot 22) + (-8 \cdot 7 \cdot (-11) \cdot 22)/(21 \cdot 7 \cdot (-11) \cdot 22) + (5 \cdot 7 \cdot (-11) \cdot 21)/(22 \cdot 7 \cdot (-11) \cdot 21)

Simplifying the fractions:


\displaystyle (-1386)/(-230514) + (1848)/(-230514) + (-1936)/(-230514) + (1155)/(-230514)

Combining the fractions:


\displaystyle (-1386 + 1848 - 1936 + 1155)/(-230514)

Simplifying the numerator:


\displaystyle (-319)/(-230514)

Dividing the numerator and denominator:


\displaystyle (319)/(230514)

Therefore, the sum of the fractions 3/7, 6/-11, -8/21, and 5/22 is 319/230514.


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User Jessee
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