Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Sọi dây làm dài số mét là:
18 : 1 x3 = 54(m)
Đ/s: 54 m
Phần cam đã bán được là: 1/3+1/2=5/6(phần)
Phần còn lại là 1-5/6=1/6(phần)
`y : 5/11 = 2/5 : 2`
`=> y : 5/11 = 2/5 xx1/2`
`=> y : 5/11 = 2/10`
`=> y : 5/11 =1/5`
`=> y= 1/5 xx 5/11`
`=> y= 5/55`
`=> y=1/11`
1200-31/40=47969/40
câu 2 =45/56+25/56=(45+25)/56=70/56=5/4
\(\dfrac{25}{30}=\dfrac{5}{7};\dfrac{9}{15}=\dfrac{3}{5};\dfrac{6}{10}=\dfrac{3}{5};\dfrac{10}{12}=\dfrac{5}{6}\)
tự xem cái nào giống
a) \(\dfrac{3}{5};\dfrac{5}{6}\) : phân số tối giản
\(\dfrac{25}{30}=\dfrac{25:5}{30:5}=\dfrac{5}{6}\)
\(\dfrac{9}{15}=\dfrac{9:3}{15:3}=\dfrac{3}{5}\)
\(\dfrac{10}{12}=\dfrac{10:2}{12:2}=\dfrac{5}{6}\)
\(\dfrac{6}{10}=\dfrac{6:2}{10:2}=\dfrac{3}{5}\)
b) \(\dfrac{3}{5}=\dfrac{9}{15}=\dfrac{6}{10}\) ; \(\dfrac{5}{6}=\dfrac{25}{30}=\dfrac{10}{12}\)
a: =>x-5/14=6/14-1/14=5/14
=>x=10/14=5/7
b; =>2/9:x=3/6+4/6=7/6
=>x=2/9:7/6=2/9*6/7=4/21
c: =>32:x=8
=>x=4
`@` `\text {Answer}`
`\downarrow`
`a,`
`x - 5/14 = 3/7 - 1/14`
`x - 5/14 = 5/14`
`=> x = 5/14 + 5/14`
`=> x = 5/7`
Vậy, `x = 5/7`
`b,`
`2/9 \div x = 1/2 + 2/3`
`2/9 \div x = 7/6`
`x = 2/9 \div 7/6`
`x = 4/21`
Vậy, `x = 4/21`
`c,`
\(\dfrac{6}{32\div x}=\dfrac{12}{16}\)
`6/(32 \div x) = 3/4`
`32 \div x = 6 \div 3/4`
`32 \div x = 8`
` x = 32 \div 8`
`x = 4`
Vậy, `x = 4`
98775 - 32 x 85
=98775 -2720
=96055
67500 - 24 x 236
= 67500 -5664
=61836
568 + 101598 : 287
= 568 +354
=922
6875 + 980 -180
=7855 -180
=7675
\(\dfrac{2}{5}+\dfrac{3}{10}-\dfrac{1}{2}\)
\(=\dfrac{7}{10}-\dfrac{1}{2}\)
= \(\dfrac{1}{5}\)
\(\dfrac{8}{11}+\dfrac{8}{33}x\dfrac{3}{4}\)
\(=\dfrac{8}{11}+\dfrac{2}{11}\)
\(=\dfrac{10}{11}\)
\(\dfrac{7}{9}x\dfrac{3}{14}:\dfrac{5}{8}\)
\(=\dfrac{1}{6}:\dfrac{5}{8}\)
\(=\dfrac{1}{6}x\dfrac{8}{5}\)
\(=\dfrac{8}{30}\)
\(=\dfrac{4}{15}\)
\(\dfrac{5}{12}-\dfrac{7}{32}:\dfrac{21}{16}\)
\(=\dfrac{5}{12}-\dfrac{7}{32}x\dfrac{16}{21}\)
\(=\dfrac{5}{12}-\dfrac{1}{6}\)
\(=\dfrac{5}{12}-\dfrac{2}{12}\)
\(=\dfrac{3}{12}=\dfrac{1}{4}\)
\(\Leftrightarrow\dfrac{7}{x-5}=\dfrac{7}{4}\)
\(\Leftrightarrow x-5=4\Leftrightarrow x=9\)
ĐKXĐ:\(x\ne5\)
\(\dfrac{7}{x-5}=\dfrac{56}{32}\\ \Rightarrow\dfrac{7}{x-5}=\dfrac{7}{4}\\ \Rightarrow x-5=4\\ \Rightarrow x=5+4\\ \Rightarrow x=9\left(tm\right)\)