\(a,x-\frac{3}{4}=\frac{1}{7}\)

\(x=\frac{1}{7}+\frac{3}{4}=\frac{25}{28}\)

\(b,\frac{15}{x}-\frac{1}{3}=\frac{28}{51}\)

\(\frac{15}{x}=\frac{28}{51}-\frac{1}{3}=\frac{15}{17}\)

\(\Rightarrow x=17\)

học tốt ~~~

\(x-\frac{3}{4}=\frac{1}{7}\)

\(x\)          \(=\frac{1}{7}+\frac{3}{4}\)

\(x\)          \(=\frac{4}{28}+\frac{21}{28}\)

\(x\)           \(=\frac{4+21}{28}\)

\(x\)             \(=\frac{25}{28}\)

a) x - 3/4 = 1/7

    x          = 1/7 +3/4

    x          = 4/28 + 21/28

    x          = 25/28

b) 15/x - 1/3 = 28/51

     15/x        = 28/51 + 1/3

     15x        = 28/51 + 17/51

     15/x       = 15/17

         x        = 15 : 15/17

         x        = 17

Bài 1:

a, (-246-154)+400=-400+400=0

b, =(-34-89+123)+451=2+451=453

c,=(-7-15)+(-250+250)=-22

BÀI 1: A) 0

B) 451

C) -22

BIẾT MỖI BÀI 1

THÔNG CẢM GIÚP 

Bài 2:

a, x-12=-4

<=> x=8

b,\(25-|x-1|=25\)

\(\Leftrightarrow|x-1|=0\)

=> x-1=0

x=1

c,\(|9-x|=24\)

\(\Leftrightarrow\orbr{\begin{cases}9-x=24\\9-x=-24\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=-15\\x=33\end{cases}}\)

\(a.x+9=-7\)

\(x=-7-9\)

\(x=-16\)

\(b.x+51=19\)

\(x=19-51\)

\(x=-32\)

\(c.x-4=-8\)

\(x=-8+4\)

\(x=-4\)

\(d.41-x=-12\)

\(x=41-\left(-12\right)\)

\(x=53\)

\(e.|x|-2=5\)

\(|x|=7\)

\(\Rightarrow TH1:x=7\)

\(TH2:x=-7\)

\(f.|x-2|=5\)

\(\Rightarrow TH1:x-2=5\)

\(x=7\)

\(TH2:x-2=-5\)

\(x=-3\)

\(g.\left(x-5\right)\left(7+x\right)=0\)

\(TH1:x-5=0\)

\(x=5\)

\(TH2:7+x=0\)

\(x=-7\)

a) x+9=-7             b)     x+51=19                           c)x-4=8 x=8-4 x=4

x=-7-9 x=-16.            x=19-51 x=-32

a) x = -7 - 9 = -16

b) x = 19 - 51 = -32

c) x = -8 + 4 = -4

d) x = 41 + 12 = 53

e) |x| = 7

         +) x = 7

         +) x = -7

f) +) x - 2 = 5 <=> x = 7

   +) x - 2 = -5 <=> x = -3

g) +) x - 5 = 0 <=> x = 5

    +) 7 + x = 0 <=> x = -7

( những câu có dấu + là 2 trường hợp nhé vd x = a hoặc x = b)

( viết hơi tắt nhé, tại mk nhác bấm máy quá :))) )

j HGBYH B

A)  7/38 x 9/11 +7/38 x 4/11 -7/38 x 2/11

=7/38.(9/11+4/11-2/11)

=7/38

B) 5/31 x 21/25 + 5/31 x -7/10 - 5/31 x 9/20

=5/31.(21/25-7/10-9/20)

=5/31.(-31/100)

=-1/20

\(a,\dfrac{-1}{8}=\dfrac{3}{x}\\ \dfrac{3}{-24}=\dfrac{3}{x}\\ x=-24\\ b,\dfrac{x}{3}=\dfrac{3}{x}\\ x.x=3.3\\ x^2=9\\ x=\pm3\\ c,\dfrac{3}{4}.x=1\dfrac{1}{2}\\ \dfrac{3}{4}.x=\dfrac{3}{2}\\ x=\dfrac{3}{2}:\dfrac{3}{4}\\ x=2\\ d,x-\dfrac{3}{10}=\dfrac{7}{15}:\dfrac{3}{5}\\ x-\dfrac{3}{10}=\dfrac{7}{9}\\ x=\dfrac{7}{9}+\dfrac{3}{10}\\ x=\dfrac{97}{90}\\ e,\dfrac{-4}{7}-x=\dfrac{-8}{3}.\dfrac{3}{7}\\ \dfrac{-4}{7}-x=\dfrac{-8}{7}\\ x=\dfrac{-4}{7}+\dfrac{8}{7}\\ x=\dfrac{4}{7}\\ \)

f: =>x*4/7=1/5+2/3=3/15+10/15=13/15

=>x=91/60

g: =>1/3:3x=1/5-2/3=-7/15

=>3x=-5/7

=>x=-5/21

h: =>7/8x=-1/9

=>x=-1/9:7/8=-1/9*8/7=-8/63

j: =>(2,8x-50)=34

=>2,8x=84

=>x=30

a) Ta có : ( x + 1 ).( 3 - x ) > 0

Th1 : \(\hept{\begin{cases}x+1>0\\3-x>0\end{cases}\Rightarrow\hept{\begin{cases}x>-1\\x>3\end{cases}\Rightarrow}x>3}\)

Th2 : \(\hept{\begin{cases}x+1< 0\\3-x< 0\end{cases}\Rightarrow\hept{\begin{cases}x< -1\\x< 3\end{cases}\Rightarrow}x< -1}\)

sao ko ai làm giúp mk vậy

a)\(x+\frac{15}{16}+\frac{7}{8}=\frac{15}{4}\)

\(x+\frac{29}{16}=\frac{15}{4}\)

\(x=\frac{15}{4}-\frac{29}{16}\)

\(x=\frac{31}{16}\)

b)\(x-\frac{27}{28}-\frac{9}{14}=\frac{13}{7}\)

\(x-\frac{45}{28}=\frac{13}{7}\)

\(x=\frac{13}{7}+\frac{45}{28}\)

\(x=\frac{97}{28}\)

c)\(x\times\frac{1}{5}+x+\frac{1}{6}=\frac{2}{3}\)

\(x\times\frac{1}{5}+x=\frac{2}{3}-\frac{1}{6}\)

\(x\times\left(\frac{1}{5}+1\right)=\frac{1}{2}\)

\(x\times\frac{6}{5}=\frac{1}{2}\)

\(x=\frac{1}{2}:\frac{6}{5}\)

\(x=\frac{5}{12}\)

d)\(x:14=\frac{1}{4}+\frac{2}{9}+\frac{3}{4}\)

\(x:14=\frac{11}{9}\)

\(x=\frac{11}{9}\times14\)

\(x=\frac{154}{9}\)

#H