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13. Calculați în două moduri:
a) (- 4 supra 3) × ( - 5 supra 8 + 1 supra 4)
b) 37 supra 25 × ( 7 supra 5 - 3 supra 20)
c) - 2 1 supra 2 × ( - 1 supra 2 - 3 supra 5)
d) 0,75 × ( - 7 supra 3 + 5 supra 6)
e) 2,25 × ( - 1 supra 7 + 1 supra 21)
f) - 1,1 × ( 3 supra 11 - 1 supra 22)


( dau coroană!)​


Răspuns :

[tex]\it a)\ \ -\dfrac{4}{3}\cdot\bigg(-\dfrac{5}{8}+\dfrac{^{2)}1}{\ \ 4}\bigg)=-\dfrac{4}{3}\cdot\dfrac{-5+2}{8}=-\dfrac{4}{3}\cdot\dfrac{-3}{8}=\dfrac{\ \ 12^{(12}}{24}=\dfrac{1}{2}[/tex]

[tex]\it a)\ \ -\dfrac{4}{3}\cdot\bigg(-\dfrac{5}{8}+\dfrac{1}{4}\bigg)=\dfrac{\not4}{3}\cdot\dfrac{5}{\not8\ _2}-\dfrac{\not4}{3}\cdot\dfrac{1}{\not4}=\dfrac{5}{6}-\dfrac{^{2)}1}{\ \ 3}=\dfrac{\ \ 3^{(3}}{6}=\dfrac{1}{2}[/tex]