$\dfrac23.\dfrac{15}4+\dfrac{-1}7$ $=\dfrac{2.15}{3.4}+\dfrac{-1}7$ $=\dfrac{15}{6}+\dfrac{-1}7$ $=\dfrac{15.7}{42}+\dfrac{-6}{42}$ $=\dfrac{105}{42}+\dfrac{-6}{42}$ $=\dfrac{105-6}{42}$ $=\dfrac{99}{42}$ $=\dfrac{33}{14}$ Bình luận
2/3 x 15/4 + (-1/7) = (2 x 15) / (3 x 4) – 1/7 = 30/12 – 1/7 = 5/2 – 1/7 = 35/14 – 2/14 = 33/14 Vậy 2/3 x 15/4 + (-1/7) = 33/14 Bình luận
$\dfrac23.\dfrac{15}4+\dfrac{-1}7$
$=\dfrac{2.15}{3.4}+\dfrac{-1}7$
$=\dfrac{15}{6}+\dfrac{-1}7$
$=\dfrac{15.7}{42}+\dfrac{-6}{42}$
$=\dfrac{105}{42}+\dfrac{-6}{42}$
$=\dfrac{105-6}{42}$
$=\dfrac{99}{42}$
$=\dfrac{33}{14}$
2/3 x 15/4 + (-1/7)
= (2 x 15) / (3 x 4) – 1/7
= 30/12 – 1/7
= 5/2 – 1/7
= 35/14 – 2/14
= 33/14
Vậy 2/3 x 15/4 + (-1/7) = 33/14