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a) Ta có : \(\frac{a}{b}+\frac{5}{6}=\frac{7}{8}\)=> \(\frac{a}{b}=\frac{7}{8}-\frac{5}{6}\)
=> \(\frac{a}{b}=\frac{21}{24}-\frac{20}{24}=\frac{1}{24}\)
Vậy \(\frac{a}{b}=\frac{1}{24}\)
b) \(\frac{a}{b}\times\frac{2}{3}=\frac{3}{4}\)
=> \(\frac{a}{b}=\frac{3}{4}:\frac{2}{3}=\frac{3}{4}\times\frac{3}{2}=\frac{9}{8}\)
Vậy \(\frac{a}{b}=\frac{9}{8}\)
c) \(\frac{5}{8}-\frac{a}{b}=\frac{5}{12}\)
=> \(\frac{a}{b}=\frac{5}{8}-\frac{5}{12}=\frac{15}{24}-\frac{10}{24}=\frac{5}{24}\)
Vậy \(\frac{a}{b}=\frac{5}{24}\)
d) \(\frac{5}{8}+\frac{a}{b}=\frac{13}{8}\)
=> \(\frac{a}{b}=\frac{13}{8}-\frac{5}{8}=\frac{8}{8}=1\)
Vậy : ....
a) 4/7 x X = 1/5 + 2/3
=> 4/7 x X = 3/15 + 10/15
=> 4/7 x X = 13/15
=> X = 13/15 : 4/7
=> X = 13/15 x 4/7 = 52/105
a ) 4 / 7 x X = 1 / 5 + 2 / 3
= > 4 / 7 x X = 3 / 1 5 + 1 0 / 1 5
= > 4 / 7 x X = 1 3 / 1 5
= > X = 1 3 / 1 5 : 4 / 7
= > X = 1 3 / 1 5 x 4 / 7
= 5 2 / 1 0 5
1./ \(\frac{X+\frac{5}{3}}{2}=\frac{7}{3}\Leftrightarrow X+\frac{5}{3}=\frac{14}{3}\Leftrightarrow X=\frac{14-5}{3}=\frac{9}{3}=3.\)
2./ \(\frac{21}{4}dm^2=\frac{21}{4}\cdot\left(100\right)^2mm^2=52.500mm^2.\)
\(75000m^2=75000\cdot\frac{1}{100^2}hm^2=7,5hm^2\)
3./
a) Tổng bằng 8; Tỷ bằng 1/3. Tổng số phần bằng nhau là 1+3=4. =>\(a=\frac{8}{4}\cdot1=2\)và \(b=\frac{8}{4}\cdot3=6\)
b) Hiệu bằng 50; Tỷ bằng 5/3. Hiệu số phần bằng nhau là: 5-3=2 =>\(a=\frac{50}{2}\cdot5=125\)và \(b=\frac{50}{2}\cdot3=75\).
a, x : \(\frac{5}{4}\) = \(\frac{9}{5}\) + \(\frac{1}{2}\)
x : \(\frac{5}{4}\) = \(\frac{23}{10}\)
x= \(\frac{23}{10}\) x \(\frac{5}{4}\)
x= \(\frac{23}{8}\)
c, ( x + \(\frac{3}{4}\) ) x \(\frac{5}{7}\) = \(\frac{10}{9}\)
x + \(\frac{3}{4}\) = \(\frac{10}{9}\) : \(\frac{5}{7}\)
x + \(\frac{3}{4}\) = \(\frac{14}{9}\)
x= \(\frac{14}{9}\) - \(\frac{3}{4}\)
x= \(\frac{56}{36}\) - \(\frac{27}{36}\)
x= \(\frac{29}{36}\)
Tk mk nha
\(x:\frac{5}{4}=\frac{9}{5}+\frac{1}{2}\Leftrightarrow x:\frac{5}{4}=\frac{23}{10}\)
\(\Leftrightarrow x=\frac{23}{10}.\frac{5}{4}\Leftrightarrow x=\frac{23}{8}\)
\(\left(x+\frac{3}{4}\right).\frac{5}{7}=\frac{10}{9}\Leftrightarrow x+\frac{3}{4}=\frac{10}{9}:\frac{5}{7}\)
\(\Leftrightarrow x+\frac{3}{4}=\frac{14}{9}\Leftrightarrow x=\frac{14}{9}-\frac{3}{4}\Leftrightarrow x=\frac{29}{36}\)
Bài làm :
\(a,x-\frac{3}{4}=\frac{7}{5}\)
\(\Rightarrow x=\frac{7}{5}+\frac{3}{4}\)
\(\Rightarrow x=\frac{43}{20}\)
b, Thiếu đề bài kìa cậu ơi !!!!!!!!!
Học tốt
a)5/14:x+3/10=1/2
=>5/14:x=1/2-3/10
=>5/14:x=1/5
=>x=5/14:1/5
=>x=25/14
vậy x=15/14
\(\frac{A}{B}\):\(\frac{3}{5}\)=\(\frac{4}{7}\)
x =\(\frac{4}{7}\)X\(\frac{3}{5}\)
x =\(\frac{12}{35}\)
\(\frac{5}{6}\)__\(\frac{A}{B}\)=\(\frac{2}{9}\)
x =\(\frac{5}{6}\)__\(\frac{2}{9}\)
x =\(\frac{33}{54}\)
a) 2/3 x a/ b = 3/5 b) a/b : 4/5 = 5/7
a/b = 3/5 : 2/3 a/b = 5/7x 4/5
a/b= 9/10 a/b = 20 / 35