Toán Lớp 7: 2/3 mũ 3 – 3/4 mũ 2 × (-1) mũ 5
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Toán Lớp 7: 2/3 mũ 3 – 3/4 mũ 2 × (-1) mũ 5
Comments ( 2 )
($\dfrac{2}{3}$)³ – ($\dfrac{3}{4}$)² × (-1)$^{5}$
= $\dfrac{8}{27}$ – $\dfrac{9}{16}$ x (-1)
= $\dfrac{8}{27}$ – $\dfrac{-9}{16}$
= $\dfrac{128}{432}$ – $\dfrac{-243}{432}$
= $\dfrac{371}{432}$
———–
(2/3) ^3 – (3/4) ^ 2 × (-1) ^ 5
=8/27 – 9/16 × (-1)
=8/27 – (-9/16)
=8/27 +9/16
=371/432