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x - 5 / 6 = 12 / 7
x = 12 / 7 + 5 / 6
x = 107 / 42
x + 4 / 5 = 8 / 3
x = 8 / 3 - 4 / 5
x = 28 / 15
x * 3 / 9 = 11 / 7 - 3 / 4
x * 3 / 9 = 23 / 28
x = 23 / 28 : 3 / 9
x = 69 / 28
5 / 9 : x = 1 / 3 + 2 / 5
5 / 9 : x = 11 / 15
x = 5 / 9 : 11 / 15
x = 25 / 33
\(1\frac{3}{4}-x=\frac{3}{8}\)
x = 11 / 8
15 , 21 - x = 5 , 6 + 1 , 2
15 , 21 - x = 6 , 8
x = 15 , 21 - 6 , 8
x = 8 , 41
C1 : ( 6 , 75 + 3 , 25 ) * 42
= 10 * 42
= 420
C 2 : ( 6 , 75 + 3 , 25 ) * 42
= 6,75 * 42 + 3,25 * 42
= 283 , 5 + 136 , 5
= 4200
C 1 : ( 9 , 6 - 4 , 2 ) * 3 , 6
= 5 , 4 * 3 , 6
= 19 , 44
C 2 : ( 9 , 6 - 4 , 2 ) * 3 , 6
= 9 , 6 * 3 , 6 - 4 , 2 * 3 , 6
= 34 , 56 - 15 , 12
= 19 , 44
x - (\(\dfrac{1}{4}\) + \(\dfrac{1}{8}\)) = \(\dfrac{5}{8}\)
x - \(\dfrac{3}{8}\) = \(\dfrac{5}{8}\)
\(x\) = \(\dfrac{5}{8}\) + \(\dfrac{3}{8}\)
\(x\) = 1
\(x.\dfrac{3}{4}=\dfrac{1}{5}.\dfrac{9}{8}\)
\(x.\dfrac{3}{4}=\dfrac{9}{40}\)
\(x=\dfrac{9}{40}:\dfrac{3}{4}\)
\(x=\dfrac{3}{10}\)
Vậy \(x=\dfrac{3}{10}\)
\(a,x+\frac{3}{8}=\frac{4}{3}\)
\(x=\frac{4}{3}-\frac{3}{8}\)
\(x=\frac{23}{24}\)
\(b,x-\frac{1}{9}=\frac{7}{6}\)
\(x=\frac{7}{6}+\frac{1}{9}\)
\(x=\frac{23}{18}\)
\(c,x\times\frac{1}{9}=\frac{21}{8}\)
\(x=\frac{21}{8}:\frac{1}{9}\)
\(x=\frac{189}{8}\)
\(d,x:\frac{8}{3}=5\)
\(x=5\times\frac{8}{3}\)
\(x=\frac{40}{3}\)
a) Cách 1
\(\frac{8}{15}:\frac{2}{3}+\frac{7}{15}:\frac{2}{3}\)
\(=\frac{8}{15}.\frac{3}{2}+\frac{7}{15}.\frac{3}{2}\)
\(=\frac{4}{5}+\frac{7}{10}=\frac{3}{2}\)
Cách 2
\(\frac{8}{15}:\frac{2}{3}+\frac{7}{15}:\frac{2}{3}\)
\(=\left(\frac{8}{15}+\frac{7}{15}\right).\frac{3}{2}\)
\(=1.\frac{3}{2}=\frac{3}{2}\)
a) C1: 8/15 : 2/3 + 7/15 : 2/3
= 4/5 + 7/10
= 3/2
C2: 8/15 : 2/3 + 7/15 : 2/3
= ( 8/15 + 7/15 ) : 2/3
= 1 : 2/3
= 3/2
b) C1: 4/9 x 3/5 + 5/9 x 3/5
= 4/15 + 1/3
= 3/5
C2: 4/9 x 3/5 + 5/9 x 3/5
= ( 4/9 + 5/9 ) x 3/5
= 1 x 3/5
= 3/5
Chúc bạn học tốt :)
\(\frac{2}{3}:\frac{x}{5}+\frac{5}{7}=\frac{2}{7}:\frac{3}{5}+\frac{9}{10}\)
\(\frac{2}{3}.\frac{5}{x}=\frac{2}{7}.\frac{5}{3}+\frac{9}{10}-\frac{5}{7}\)
\(\frac{10}{3}:x=\frac{10}{21}+\frac{9}{10}-\frac{5}{7}=\frac{100+189-150}{210}=\frac{139}{210}\)
\(x=\frac{700}{139}\)
\(x+\dfrac{3}{4}=\dfrac{1}{2}+\dfrac{9}{8}\\ x+\dfrac{3}{4}=\dfrac{4}{8}+\dfrac{9}{8}\\ x+\dfrac{3}{4}=\dfrac{13}{8}\\ x=\dfrac{13}{8}-\dfrac{3}{4}\\ x=\dfrac{13}{8}-\dfrac{6}{8}\\ x=\dfrac{7}{8}\)
x + 3/4 = 1/2 + 9/8
x + 3/4 = 13/8
x = 13/8 -3/4
x = 7/8