sửa đề đến đây thôi bạn nhé, do nếu thêm vào thì mình cũng ko biết có quy luật gì nữa :<

\(\dfrac{x-1}{99}-1+\dfrac{x-3}{97}-1+\dfrac{x-5}{95}-1=\dfrac{x-2}{98}-1+\dfrac{x-4}{96}-1\)

\(\Leftrightarrow\dfrac{x-100}{99}+\dfrac{x-100}{97}+\dfrac{x-100}{95}=\dfrac{x-100}{98}+\dfrac{x-100}{96}\)

\(\Leftrightarrow\left(x-100\right)\left(\dfrac{1}{99}+\dfrac{1}{97}+\dfrac{1}{95}-\dfrac{1}{98}-\dfrac{1}{96}\ne0\right)=0\Leftrightarrow x=100\)

1.

a) -[ -345 + 1234 - 2014] - (345 - 1234)

= 345 - 1234 + 2014 - 345 + 1234

= ( 345 - 345) + ( -1234 +1234) +2014

= 0 + 0 + 2014 = 2014

b) ( -31) . 47 + ( -31) . 52 + ( -31)

= (-31) . ( 47 + 52 +1)

= (-31) . 100 = -3100

c) 654 +{ 374 - [ 654 - ( +126)]}

= 654 + [ 374 -( 654 - 126)]

= 654 + ( 374 - 654 + 126)

= 654 + 374 - 654 + 126

= ( 654 - 654 ) + ( 374 + 126 )

= 0 + 500 = 500

a) -[ -345 + 1234 - 2014] - (345 - 1234)

= 345 - 1234 + 2014 - 345 + 1234

= ( 345 - 345) + ( -1234 +1234) +2014

= 0 + 0 + 2014 = 2014

b) ( -31) . 47 + ( -31) . 52 + ( -31)

= (-31) . ( 47 + 52 +1)

= (-31) . 100 = -3100

c) 654 +{ 374 - [ 654 - ( +126)]}

= 654 + [ 374 -( 654 - 126)]

= 654 + ( 374 - 654 + 126)

= 654 + 374 - 654 + 126

= ( 654 - 654 ) + ( 374 + 126 )

= 0 + 500 = 500

a) -[ -345 + 1234 - 2014] - (345 - 1234)

= 345 - 1234 + 2014 - 345 + 1234

= ( 345 - 345) + ( -1234 +1234) +2014

= 0 + 0 + 2014 = 2014

b) ( -31) . 47 + ( -31) . 52 + ( -31)

= (-31) . ( 47 + 52 +1)

= (-31) . 100 = -3100

c) 654 +{ 374 - [ 654 - ( +126)]}

= 654 + [ 374 -( 654 - 126)]

= 654 + ( 374 - 654 + 126)

= 654 + 374 - 654 + 126

= ( 654 - 654 ) + ( 374 + 126 )

= 0 + 500 = 500

tick và theo dõi giúp mình nha

a)8/27
b)24/7
c)47468

a) 34/29x13/17-10/27=26/29-10/27=412/783
b) 2+4/7:2/5=2+10/7=24/7
c) 968x49+35460:985=47432+36=47468

a) 34/29x13/17-10/27=26/29-10/27=412/783
b) 2+4/7:2/5=2+10/7=24/7
c) 968x49+35460:985=47432+36=47468

70 814;    31 727;        186 163;             7346

\(\frac{x-971}{972}+\frac{x-973}{970}+\frac{x-975}{968}+\frac{x-977}{966}=\frac{x-972}{971}+\frac{x-970}{973}+\frac{x-968}{975}+\frac{x-966}{977}\)

\(\Rightarrow\frac{x-971}{972}-1+\frac{x-973}{970}-1+\frac{x-975}{968}-1+\frac{x-977}{966}-1=\frac{x-972}{971}-1+\frac{x-970}{973}-1+\frac{x-968}{975}-1+\frac{x-966}{977}-1\)\(\Rightarrow\frac{x-1943}{972}+\frac{x-1943}{970}+\frac{x-1943}{968}+\frac{x-1943}{966}=\frac{x-1943}{971}+\frac{x-1943}{973}+\frac{x-1943}{975}+\frac{x-966}{977}\)

\(\Leftrightarrow\frac{x-1943}{972}+\frac{x-1943}{970}+\frac{x-1943}{968}+\frac{x-1943}{966}-\frac{x-1943}{971}-\frac{x-1943}{973}-\frac{x-1943}{975}-\frac{x-966}{977}=0\)

\(\Leftrightarrow\left(x-1943\right).\left(\frac{1}{972}+\frac{1}{970}+\frac{1}{968}+\frac{1}{966}-\frac{1}{971}-\frac{1}{973}+\frac{1}{975}+\frac{1}{977}\right)=0\)

\(\Leftrightarrow\left(x-1943\right)=0\Leftrightarrow x=1943\)

Vậy...

894746 X 2 = 1789492

654 X 4 =2616

894746 x 2= 1789492

654 x 4= 1616

 894746 x 2=1789492

654 x 4=2616

654 - 2(x - 1) = 456 : 76

=> 654 - 2(x - 1) = 6

=> 2(x - 1) = 648

=> x - 1 = 324

=> x = 325

\(654-2\left(x-1\right)=456:76\)

\(654-2\left(x-1\right)=6\)

\(2\left(x-1\right)=654-6\)

\(2\left(x-1\right)=648\)

\(x-1=648:2\)

\(x-1=324\)

\(x=324+1\)

\(x=325\)

Học tốt

x - 5 = 8 x 121

x - 5 = 968

 x= 968 + 5 

 x= 973

chính là A

x:8=121 ( dư 5 )

x=121x8+5

x=968+5

x=973

Đáp án:A nha