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20.25-\frac{2}{3}\times 4.5
Calculate 4.5 to the power of 2 and get 20.25.
20.25-\frac{2}{3}\times \frac{9}{2}
Convert decimal number 4.5 to fraction \frac{45}{10}. Reduce the fraction \frac{45}{10} to lowest terms by extracting and canceling out 5.
20.25-\frac{2\times 9}{3\times 2}
Multiply \frac{2}{3} times \frac{9}{2} by multiplying numerator times numerator and denominator times denominator.
20.25-\frac{9}{3}
Cancel out 2 in both numerator and denominator.
20.25-3
Divide 9 by 3 to get 3.
17.25
Subtract 3 from 20.25 to get 17.25.