Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(a,\dfrac{6}{11}+6+\dfrac{5}{7}=\dfrac{42+462+55}{77}=\dfrac{559}{77}\)
\(b,\dfrac{9}{8}\times\dfrac{3}{12}:\dfrac{5}{9}=\dfrac{9}{8}\times\dfrac{3}{12}\times\dfrac{9}{5}=\dfrac{243}{480}=\dfrac{81}{160}\)
\(c,\dfrac{8}{7}:4+2=\dfrac{8}{7}\times\dfrac{1}{4}+2=\dfrac{8}{28}+2=\dfrac{2}{7}+2=\dfrac{16}{7}\)
\(d,\dfrac{3}{5}+4:\dfrac{6}{4}=\dfrac{3}{5}+4\times\dfrac{4}{6}=\dfrac{3}{5}+\dfrac{8}{3}=\dfrac{49}{15}\)
4/5 + 5/6 : 3/2
= 4/5 + 5/9
= 61/45
3/5 : 4/6 - 3/1
= 9/10 - .3
= -21/10
4/6 : 5/4 + 3/2
= 8/15 + 3/2
= 61/30
\(\frac{4}{5}\)+ \(\frac{5}{6}\): \(\frac{3}{2}\)= \(\frac{61}{45}\)
\(\frac{3}{5}\): \(\frac{4}{6}\)- \(\frac{3}{1}\)= - \(\frac{21}{10}\)= -2,1
\(\frac{4}{6}\): \(\frac{5}{4}\)+ \(\frac{3}{2}\)= \(\frac{61}{30}\)
\(6\times\dfrac{3}{5}+\dfrac{4}{3}\)
\(=\dfrac{9}{5}+\dfrac{4}{3}\)
\(=\dfrac{27+20}{15}\)
\(=\dfrac{45}{15}\)
\(=3\)
\(a,6:\dfrac{5}{2}-\dfrac{3}{10}=6\times\dfrac{2}{5}-\dfrac{3}{10}=\dfrac{12}{5}-\dfrac{3}{10}=\dfrac{120}{50}-\dfrac{15}{50}=\dfrac{105}{50}=\dfrac{21}{10}\)
\(b,\dfrac{4}{6}:\dfrac{4}{3}+5:\dfrac{4}{3}=\left(\dfrac{4}{6}+5\right):\dfrac{4}{3}=\left(\dfrac{4}{6}+\dfrac{30}{6}\right):\dfrac{4}{3}=\dfrac{34}{6}\times\dfrac{3}{4}=\dfrac{102}{24}=\dfrac{17}{4}\)
a.\(\dfrac{27}{8}\)
b.\(\dfrac{37}{40}\)
c.\(\dfrac{5}{2}\)
d.\(\dfrac{7}{3}\)
e.5
g.\(\dfrac{53}{16}\)
Bài 1 :
a) \(\dfrac{3}{2}+\dfrac{5}{4}+\dfrac{5}{8}=\dfrac{12}{8}+\dfrac{10}{8}+\dfrac{5}{8}=\dfrac{12+10+5}{8}=\dfrac{27}{8}\)
b) \(\dfrac{4}{5}-\dfrac{3}{8}+\dfrac{2}{4}=\dfrac{32}{40}-\dfrac{15}{40}+\dfrac{20}{40}=\dfrac{32-15+20}{40}=\dfrac{37}{40}\)
c) \(3+\dfrac{6}{8}-\dfrac{5}{4}=\dfrac{3}{1}+\dfrac{6}{8}-\dfrac{5}{4}=\dfrac{24}{8}+\dfrac{6}{8}-\dfrac{10}{8}=\dfrac{20}{8}=\dfrac{5}{2}\)
d) \(\dfrac{5}{6}-\dfrac{1}{2}+2=\dfrac{5}{6}-\dfrac{1}{2}+\dfrac{2}{1}=\dfrac{5}{6}-\dfrac{3}{6}+\dfrac{12}{6}=\dfrac{14}{6}=\dfrac{7}{3}\)
e) \(\dfrac{3}{5}+\dfrac{6}{11}+\dfrac{7}{13}+\dfrac{2}{5}+\dfrac{16}{11}+\dfrac{19}{13}=\left(\dfrac{3}{5}+\dfrac{2}{5}\right)+\left(\dfrac{6}{11}+\dfrac{16}{11}\right)+\left(\dfrac{7}{13}+\dfrac{19}{13}\right)=1+2+2=5\)
g) \(\dfrac{75}{100}+\dfrac{18}{21}+\dfrac{29}{32}+\dfrac{1}{4}+\dfrac{3}{21}+\dfrac{13}{32}=\dfrac{3}{4}+\dfrac{6}{7}+\dfrac{29}{32}+\dfrac{1}{4}+\dfrac{1}{7}+\dfrac{13}{32}=\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\left(\dfrac{6}{7}+\dfrac{1}{7}\right)+\left(\dfrac{29}{32}+\dfrac{13}{32}\right)=1+1+\dfrac{21}{16}=2+\dfrac{21}{16}=\dfrac{53}{16}\)
nếu các bạn trả lời phép tính của mình thì mong các vạn ghi tất cả các bước làm và phép tính ra ạ ><
1h tổ 1 lm đc:
1:4=1/4(công việc)
1h tổ 2 lm đc:
1:6=1/6(công việc)
1h tổ 3 lm đc:
1:12=1/12(công việc)
1h cả 3 tổ lm đc:
1/4+1/6+1/12=1/2(công việc)
Cả 3 tổ lm công việc đó trong:
1:1/2=2(giờ)
Lm đến số giờ là:
7h15+2h=9h15
k mk nhoa ^^
Good luck!
6+6+4+3+2+5=6+(6+4)+(3+2)+5
=6+10+5+5
=6+10+(5+5)
=26
26. Đúng thì k cho mình nhé!