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Anastaziya [24]
2 years ago
11

I don't remember how to do this

Mathematics
1 answer:
meriva2 years ago
4 0
B. Fractions have to have the same denominator so \frac{9}{10}  -  \frac{2}{5} =  \frac{9}{10} -  \frac{4}{10} which = \frac{5}{10} then you simplfy it to \frac{1}{2} so it would be B
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