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Đề bài sai nhé!
A, X x 4/8 = 4/8
x = 4/8 : 4/8
x = 1
B, 1/9 + x + 1 - 3/18
= 1/9 + 1 + 1 - 3/18
= 35/18
a) 2/5 + 1/2 + 7/10
= 4/10 + 5/10 + 7/10
= 9/10 + 7/10
= 16/10 = 8/5
b) 4/9 + 11/8 - 5/6
= 32/72 + 99/72 - 60/72
= 191/72
c) 9/20 - 8/15 x 5/12
= 9/20 - 2/9
= 41/180
d) 2/3 : 4/5 : 7/12
= 5/6 : 7/12
= 10/7
\(a.\dfrac{3}{4}\times\dfrac{5}{6}-\dfrac{1}{6}=\dfrac{5}{8}-\dfrac{1}{6}=\dfrac{11}{24}\)
\(b.\left(\dfrac{8}{9}+\dfrac{1}{3}\right):\dfrac{2}{5}=\dfrac{11}{9}:\dfrac{2}{5}=\dfrac{11}{9}\times\dfrac{5}{2}=\dfrac{55}{18}\)
\(a;\frac{3}{7}+\frac{2}{3}=\frac{9}{21}+\frac{14}{21}=\frac{23}{21}\)
\(b;\frac{8}{7}-\frac{12}{28}\times\frac{7}{3}=\frac{8}{7}-\frac{3}{7}\times\frac{7}{3}=\frac{8}{7}-1=\frac{8}{7}-\frac{7}{7}=\frac{1}{7}\)
\(c;\frac{5}{6}\times3=\frac{15}{6}=\frac{5}{2}\)
\(d;\frac{3}{2}:\frac{7}{15}=\frac{3}{2}\times\frac{15}{7}=\frac{45}{14}\)
a) 3/7+2/3=9/21+14/21=23/21
b) 8/7-12/28*7/3=8/7-1=8/7-7/7-1/7
c) 5/6*3=5/2
d) 3/2:7/15=3/2*15/7=45/14
\(\frac{3}{4}\times\frac{2}{9}+\frac{1}{3}\)
\(=\frac{1}{6}+\frac{1}{3}\)
\(=\frac{3}{18}+\frac{6}{18}=\frac{1}{2}\)
a,3/7 : 5/8 = 24/56 : 35/56 = 24/35
b, 8/7 : 3/4 = 32/28 : 21/28 = 32/21
c, 1/3: 1/2 = 2/6 : 3/6 =2/3
a}3/4x2/9+1/3=3x2/4x9+1/3=6/36+1/3=6/36+12/36=18/36=1/2
b}1/4:1/3-1/2=1x3/4x1-1/2=3/4-1/2=3/4-2/4=1/4
đáp số : a}1/2
b}1/4
9 / 8 - 1/3 x 3/4 = 27 / 24 - 8 / 24 x 3/4 = 21 / 24 x 3/4 = 7/8 x 3/4 = 21 /32
\(x\times\frac{4}{8}=\frac{3}{11}\)
=> \(x=\frac{3}{11}:\frac{4}{8}\)
=> \(x=\frac{3}{11}\times\frac{8}{4}=\frac{3}{11}\times2=\frac{6}{11}\)
Cách 1 : \(\frac{1}{9}+x=1-\frac{3}{18}\)
=> \(\frac{2}{18}+\frac{18x}{18}=\frac{18}{18}-\frac{3}{18}\)
=> 2 + 18x = 18 - 3
=> 18x = 18 - 3 - 2
=> 18x = 13
=> x = \(\frac{13}{18}\)
Cách 2 : \(\frac{1}{9}+x=1-\frac{3}{18}\)
=> \(\frac{1}{9}+x=\frac{18}{18}-\frac{3}{18}=\frac{15}{18}\)
=> \(\frac{1}{9}+x=\frac{5}{6}\)
=> \(x=\frac{5}{6}-\frac{1}{9}=\frac{15}{18}-\frac{2}{18}=\frac{13}{18}\)
X x 4/8 = 3/11
X =3/11:4/8
X = 6/11
1/9 + x = 1-3/18
1/9 + x = 5/6
x = 5/6 - 1/9
x = 13/18
k cho mình nhé.