\(\left(\frac{5}{12}-\frac{5}{7}-\frac{22}{45}+\frac{7}{12}-\frac{23}{45}\right).\left|x\right|-9=-2\)

\(\left(\frac{12}{12}-\frac{5}{7}-\frac{45}{45}\right).\left|x\right|=-2+9\)

\(\left(1-\frac{5}{7}-1\right).\left|x\right|=7\)

\(\frac{-5}{7}.\left|x\right|=7\)

\(\left|x\right|=7:\left(\frac{-5}{7}\right)\)

\(\left|x\right|=\frac{-49}{5}\)

\(\Rightarrow x\in\varnothing\) vì trị tuyệt đối của 1 số luôn dương 

a :vì 4/7=12/x

4.x=12.7

4.x=84

x=84/4

x=21

mn giải đáp án ra giúp mik nha,mik cảm ơn nhiều!Thank you!

mn bt câu nào làm câu đó ạ,mik làm ơn

a) x - 13+x = -24-7 + x

2x-13 = -31 +x

2x-x = -31+13

x = -18

b) 12.20 = 15x

240 = 15x

x = 16

c) 42(-5) = 14x

-210 = 14x

x = -15

\(\frac{5}{6}=\frac{15}{24}\) 

\(\frac{4}{7}=\frac{12}{21}\)

\(\frac{3}{9}=\frac{7}{21}\)

\(\frac{-5}{-4}=\frac{20}{16}\)

5/6 = x/24 = 5*24 = 6*x = 120 = 6*x suy ra x= 120:6=20

4/7 = 12/x = 4*x = 7*12 = 4*x = 84 suy ra x= 84:4=21

3/x = 7/21 = 3/x = 1/3 = 3*3 = 1*x = 9 = 1*x suy ra x=9:1=9

x/-4 = 20/16 = x/-4 = 5/4 = x*4 = -4*5 = x*4 = -20 suy ra x=-20:4=-5

a, 45 chia hết cho x

=> x thuộc Ư(45)

=> x thuộc {1;45;3;15;5;9}

    vậy...

b, x chia hết cho 12

=> x thuộc  B(12)

=> x thuộc {0;12;24;36;48;60;...}

             vậy.....

c, 219-7.(x+1)=100

   7.(x+1)=219-100

   7.(x+1)=119

       x+1 = 17

           x = 17-1

           x = 16                      vậy...

a, 45 \(⋮\)x \(\Rightarrow\)x\(\in\)Ư ( 45 ) = { \(\pm\)1;\(\pm\)3;\(\pm\)5;\(\pm\)9;\(\pm\)15;\(\pm\)45}
b, \(x⋮12\Rightarrow x\in B\left(12\right)=\left\{0;12;24;36;48....\right\}\)
\(c,219-7\left(x+1\right)=100\)
\(\Rightarrow7\left(x+1\right)=219-100\)
\(\Rightarrow7\left(x+1\right)=119\)
\(\Rightarrow x+1=119:7\)
\(\Rightarrow x+1=17\)
\(\Rightarrow x=16\)

a,(x+7).(x-1)=45-45

(x+7).(x-1)=0

x+7=0hoac x-1=0

tu ban lam

b,-(x-15)=-5+12

-x+15=7

-x=-2

x=2

c,(x-1).(x-1)=-2.(-32)

tu lam nhe

nhầm 15-7=8 nhe ban tu sửa

a, \(A=\frac{19}{24}-\frac{1}{2}-\frac{1}{3}-\frac{7}{24}=(\frac{19}{24}-\frac{7}{24})-\frac{1}{2}-\frac{1}{3}\)

\(=\frac{12}{24}-\frac{1}{2}-\frac{1}{3}\)

\(=\frac{1}{2}-\frac{1}{2}-\frac{1}{3}=0-\frac{1}{3}=-\frac{1}{3}\)

\(B=\frac{7}{12}+\frac{5}{6}+\frac{1}{4}-\frac{3}{7}-\frac{5}{12}=(\frac{7}{12}-\frac{5}{12})+\frac{5}{6}+\frac{1}{4}-\frac{3}{7}\)

\(=\frac{1}{6}+\frac{5}{6}+\frac{1}{4}-\frac{3}{7}\)

\(=1+\frac{1}{4}-\frac{3}{7}=\frac{23}{28}\)

b, Thay thế A = \(-\frac{1}{3}\)và B = \(\frac{23}{28}\)ta có :

\(-\frac{1}{3}-x=\frac{23}{28}\)

\(\Rightarrow x=-\frac{1}{3}-\frac{23}{28}=-\frac{28}{84}-\frac{69}{84}=\frac{-28-69}{84}=\frac{-97}{84}\)

a. x- (17 - x) = x-7

x-17+x = x+7

2x-17=x+7

2x-x= 7+17

x= 24

b. 9-25=(7-x)-(25+7)

-16=7-x-25-7

-16=-x-25

x= -25 + 16

x = -9

c. (-12)^2 .x = 56 + 10.13.x

144x = 56 + 130x

144x - 130x = 56

14x=56

x= 56 : 14

x= 4

d. 4/24 : (3x-2) = -3

4/24 = -3.(3x-2)

4/24 = -9x + 6

9x = 6 - 4/24

9x = 35/6

x= 35/6 :9

x= 35/54

e. 5/-45 chia hay nhân với (-3-2x) nhỉ

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