=1619,75

đố các bạn làm được

a/\(-\left(-432-3x\right)+\left(-432-4x+21\right)=-2345\)

\(\Leftrightarrow+432+3x-432-4x+21=-2345\)\(\Leftrightarrow\left[432+\left(-432\right)\right]+\left[\left(-4x\right)+3x\right]+21=-2345\)

\(\Leftrightarrow0+-1x+21=-2345\)\(\Leftrightarrow-1x=-2345-21=-2366\)

\(\Rightarrow x=\left(-2366\right):\left(-1\right)=2366\)

b/\(12x-\left(-3546-3x\right)=\left(2x-234\right)-\left(-678-2x\right)\)

\(\Leftrightarrow12x+3546+3x=2x-234+678+2x\)

\(\Leftrightarrow15x+3546=\left(2x+2x\right)+\left[\left(-234\right)+678\right]\)

\(\Leftrightarrow15x+3546=4x+444\)

\(\Leftrightarrow15x+3546-4x-444=0\)

\(\Leftrightarrow\left(15x-4x\right)+\left(3546-444\right)=0\)

\(\Leftrightarrow11x+3102=0\)

\(\Leftrightarrow11x=0-3102=-3102\)

\(\Rightarrow x=\left(-3102\right):11=-282\)

x + ( x + 1 ) + ( x + 2 ) + .... + ( x + 2344 ) + 2345 = 2345

      ( có 2346 số hạng ) 

x + ( x + 1 ) + ( x + 2 ) + ..... + ( x + 2344 ) = 2345 - 2345

x + ( x + 1 ) + ( x + 2 ) + ..... + ( x + 2344 ) = 0

 ( có 2345 số hạng )

[ ( x + 2344 ) + x ] . 2345 : 2 = 0

[ ( x + 2344 ) + x ] . 2345 = 0 . 2

( 2x + 2344 ) . 2345 = 0

2x + 2344 = 0 : 2345

2x + 2344 = 0

2x = 0 - 2344

2x = - 2344

x = - 2344 : 2 = - 1172

Vậy x = - 1172 

x=2344 nên x+1=2345

\(A=x^5-x^4\left(x+1\right)+x^3\left(x+1\right)-x^2\left(x+1\right)+x\left(x+1\right)-\left(x+1\right)\)

\(=x^5-x^5-x^4+x^4+x^3-x^3-x^2+x^2+x-x-1\)

=-1

a) X – 34562 = 2345

X= 2345 + 34562

X = 36907 

b) X : 34 = 1023

X= 1023 x 34

X =34782

x^5-(x+1)x^4+(x+1)x^3-(x+1)x^2+(x+1)x-(x+1)

tự làm tiếp đi

1234567890-12345

tổng mới hơn tổng cũ 500 đơn vị

ai thấy tớ đúng thì ủng hộ nha

2345 x 25 + 2345 x 75 + 2345

= 2345 x (25+75+1)

= 2345 x 101

=236845

\(=2345\times\left(25+75+1\right)\)
\(=2345\times101\)
\(=236845\)

=236845