Câu 43 tính a 5/6 + 7/8= b 5/8 – 2/5= c 9/10 x 5/6 d 6/5 : 3/7

2 bình luận về “Câu 43 tính a 5/6 + 7/8= b 5/8 – 2/5= c 9/10 x 5/6 d 6/5 : 3/7”

1. a,

   5/6 + 7/8

   = 20/24 + 21/24

   = 41/27

   b,

   5/8 – 2/5

   = 25/40 – 16/40

   = 9/40

   c,

   9/10 xx 5/6

   = {9xx5}/{10xx6}

   = 45/60

   = 3/4

   d,

   6/5 : 3/7

   = 6/5 xx 7/3

   = {6xx7}/{5xx3}

   = 42/15

   = 14/5

    

   Trả lời
2. Câu $43:$ tính

   $a)$ $\dfrac{5}{6}+$$\dfrac{7}{8}=$$\dfrac{40}{48}+$$\dfrac{42}{48}$

   $=\dfrac{41}{24}$

   $——————$

   $b) $ $\dfrac{5}{8}-$$\dfrac{2}{5}=$$\dfrac{25}{40}-$$\dfrac{16}{40}$

   $=$ $\dfrac{9}{40}$

   $——————-$

   $c)$ $\dfrac{9}{10}$$\times$$\dfrac{5}{6}=$$\dfrac{3}{4}$

   $——————-$

   $d)$ $\dfrac{6}{5}:$$\dfrac{3}{7}=$$\dfrac{6}{5}$$\times$$\dfrac{7}{3}$

   $=$ $\dfrac{14}{5}$

   Chúc bn hc tốt!~

    

   Trả lời