a) 2/3 + 3/51 b)4/7 - 11/42 c)2 1/3 x 3 1/2 d)4 1/3 : 2 1/3

Question

a) 2/3 + 3/51 b)4/7 - 11/42  c)2 1/3 x 3 1/2  d)4 1/3 : 2 1/3

myngoc · Answer

a) $ frac{2}{3}$ +$ frac{3}{51}$= $ frac{102}{153}$ +$ frac{9}{153}$ =$ frac{111}{153}$ =$ frac{35}{51}$    b) $ frac{4}{7}$ -$ frac{11}{42}$= $ frac{168}{294}$ +$ frac{77}{294}$ =$ frac{111}{153}$  =$ frac{13}{42}$    c) $2$$ frac{1}{3}$ .$3$$ frac{1}{2}$= $ frac{7}{3}$ .$ frac{7}{2}$ =$ frac{49}{6}$     d) $4$$ frac{1}{3}$ :$2$$ frac{1}{3}$= $ frac{13}{3}$ :$ frac{7}{3}$ =$ frac{39}{21}$  =$ frac{13}{7}$

giangnguyen · Answer

Đ&aacute;p &aacute;n:     `a, 37/51`   `b, 13/42`   `c, 49/6`   `d, 13/7`     Giải th&iacute;ch c&aacute;c bước giải:     `a, 2/3 + 3/51 = 34/51 + 3/51 = 37/51`   `b, 4/7 - 11/42 = 24/42 - 11/42 = 13/42`   `c, 2 1/3 xx 3 1/2 = 7/3 xx 7/2 = 49/6`   `d, 4 1/3 : 2 1/3 = 13/3 : 7/3 = 13/3 xx 3/7 = 13/7`

a) 2/3 + 3/51 b)4/7 – 11/42 c)2 1/3 x 3 1/2 d)4 1/3 : 2 1/3

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