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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
(7/5+x)-2/5=4
(7/5+x) =4+2/5
7/5+x=22/5
x=22/5-7/5
x=15/5
x=3
(x-2/3):2/5=1/4
(x-2/3)=1/4 nhân 2/5
(x-2/3)=1/10
x=1/10+2/3
x=23/30
1.
=3/5x(3/7+4/7)+2/5x(13/9-4/9)
=3/5x1+2/5x1
=3/5+2/5
=1
2.Xx(3/4+4/5)=7/10
Xx31/20=7/10
X =7/10:31/20
X =14/31
\(\frac{3}{5}\cdot\frac{3}{7}+\frac{3}{5}\cdot\frac{4}{7}+\frac{2}{5}\cdot\frac{13}{9}-\frac{2}{5}\cdot\frac{4}{9}\)
\(=\frac{3}{5}\cdot\left(\frac{3}{7}+\frac{4}{7}\right)+\frac{2}{5}\cdot\left(\frac{13}{9}-\frac{4}{9}\right)\)
\(=\frac{3}{5}\cdot1+\frac{2}{5}\cdot1\)\(=\frac{3}{5}+\frac{2}{5}=1\)
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\(\frac{3}{4}\cdot x+\frac{4}{5}\cdot x=\frac{7}{10}\)
\(\left(\frac{3}{4}+\frac{4}{5}\right)\cdot x=\frac{7}{10}\)
\(\frac{31}{20}\cdot x=\frac{7}{10}\)
\(x=\frac{7}{10}:\frac{31}{20}\)
\(x=\frac{14}{31}\)
Ta có
x+3/5=7/2
=>x=7/2-3/5=29/10
x-1/4=1/5
=> x=9/20
2-x=4/7
=>x=2-4/7=10/7
KL
k mik vs
x + \(\frac{3}{5}\)= \(\frac{7}{2}\)
x = \(\frac{7}{2}\)- \(\frac{3}{5}\)
x = \(\frac{29}{10}\)
x - \(\frac{1}{4}\)= \(\frac{1}{5}\)
x = \(\frac{1}{5}\)+ \(\frac{1}{4}\)
x = \(\frac{9}{20}\)
2 - x = \(\frac{4}{7}\)
x = 2 - \(\frac{4}{7}\)
x = \(\frac{10}{7}\)
bài2 \(x\times\dfrac{15}{16}-x\times\dfrac{4}{16}=2\)
\(x\times\dfrac{11}{16}=2\)
\(x=2:\dfrac{11}{16}\)
\(x=\dfrac{32}{11}\)
Bài 1 :
\(\dfrac{x}{16}\times\left(2017-1\right)=2\)
\(\dfrac{x}{16}\times2016=2\)
\(\dfrac{x}{16}=\dfrac{2}{2016}\)
\(x=\dfrac{2}{2016}\times16\)
\(x=\dfrac{1}{63}\)
(x + 4/3) . 7/4 = 5 - 7/6
(x + 4/3) . 7/4 = 23/6
x + 4/3 = 23/6 : 7/4
x + 4/3 = 46/21
x = 46/21 - 4/3 = 6/7
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
\(\frac{7}{4}-x\cdot\frac{4}{3}=\frac{5}{19}\)
\(\Rightarrow-x\cdot\frac{4}{3}=\frac{5}{19}-\frac{7}{4}\)
\(\Rightarrow-x\cdot\frac{4}{3}=-\frac{113}{76}\)
\(\Rightarrow x\cdot\frac{4}{3}=\frac{113}{76}\)
\(\Rightarrow x=\frac{113}{76}:\frac{4}{3}=\frac{339}{304}\)
(4/3 + x) × 7/4 = 5 - 7/6
\(\left(\frac{4}{3}+x\right).\frac{7}{4}=\frac{23}{6}\)
\(\frac{4}{3}+x=\frac{23}{6}:\frac{7}{4}\)
\(\frac{4}{3}+x=\frac{46}{21}\)
\(x=\frac{46}{21}:\frac{4}{3}\)
\(x=\frac{23}{14}\)
(4/3+x)x 7/4=23/6
(4/3+x=23/6:7/4
(4/3+x)=46/21
x=46/21- 4/3
x=6/7
1/ X : 1/7 + 1/7 = 8/9
X : 1/7 = 8/9 -1/7
X : 1/7 = 47/63
X = 47/63 x 1/7
X = 47/441
2/ X : ( 1/7 + 6/7 ) = 8/9
X : 1 = 8/9
X = 8/9 x1
X = 8/9
3/ 1/7 : ( X + 4/7 ) = 13/5
X + 4/7 = 1/7 : 13/5
X + 4/7 = 5/91
X = 5/91 - 4/7
X = -49/91
4/ 3/7 : ( X - 1/9) = 4/5
X - 1/9 = 3/7 : 4/5
X -1/9 = 15/28
X = 15/28 + 1/9
X = 163/252