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 04/08/2021 Bởi Vivian 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
Đáp án: `a, 37/51` `b, 13/42` `c, 49/6` `d, 13/7` Giải thích các 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` Bình luận
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}$= $\frac{13}{3}$ :$\frac{7}{3}$ =$\frac{39}{21}$ =$\frac{13}{7}$ Bình luận
Đáp án:
`a, 37/51`
`b, 13/42`
`c, 49/6`
`d, 13/7`
Giải thích các 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) $\frac{2}{3}$ +$\frac{3}{51}$= $\frac{102}{153}$ +$\frac{9}{153}$ =$\frac{111}{153}$ =$\frac{35}{51}$
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}$= $\frac{13}{3}$ :$\frac{7}{3}$ =$\frac{39}{21}$ =$\frac{13}{7}$