(2x-1) .789 = 0

2x - 1 = 0

2x = 1

x = 1: 2

x = 0,5

\(a)\)\(789\times77+789\times23\)

\(=\)\(789\times\left(77+23\right)\)

\(=\)\(789\times100\)

\(=\)\(78900\)

\(b)\)\(538\times624-424\times538\)

\(=\)\(538\times\left(624-424\right)\)

\(=\)\(538\times200\)

\(=\)\(107600\)

a) 789 x 77 + 789 x 23                    

=  789 x ( 77 + 23 )

= 789  x     100

=     78900

b) 538 x 624 - 424 x 538

= 538 x ( 624 - 424 )

= 538  x     200

=    107600

a,789.77+789.23                                       b,538.624-424.538

=789.(77+23)                                            =538.(624-424)

=789.100                                                  =538.200

=78900                                                    =107600

1+1+9+8+8+9+0+789 

= 2 + 18 + 16 + 789 

= 20 + 16 + 789 

= 36 + 789 

= 825

1+1+9+8+8+9+0+789=817 bạn nhé

825 nha

= 0 nhé

mik kb vs bn tk cho mik nhé

12345x12345x456x789x0=0

kbnha, tk mk nha.

123456*123456*456789*0

=0

là sao ta

Bài 1:

2² x 567 - 356 x 2² + 2² x 789

= 2² x ( 567 - 356 + 789 )

= 4 x 1000

= 4000 

Bài 2:

12x - 10x = 5⁸ + 201⁰

2x = 390626

x = 390626 : 2 

x = 195313

57 + 469 + 374 + 531 + 426 + 143

\(=\left(57+143\right)+\left(469+531\right)+\left(374+426\right)\)

\(=200+1000+800=2000\)

9⁸ : 9⁶ - 2 . 2⁴ + 789⁰

^{\(=9^2-2^5+1\)}

^{\(=81-32+1=50\)}

chúc bạn học tốt

57+469+374+531+426+143
=(57+143)+(469+531)+(374+426)
=200+1000+800
=2000

9⁸:9⁶-2.2⁴+789⁰
=9²-2⁵+1
=81-31+1
=50+1
=21
Chúc hok tốt
nhớ k mk nha

\(57+469+374+531+143\)

\(=\left(57+143\right)+\left(469+531\right)+\left(374+426\right)\)

\(=200+1000+800=2000\)

\(9^8\div9^6-2.2^4+789^0\)

\(=9^2-2^5+1\)

\(=81-32+1\)

\(=\left(81+1\right)-32\)

\(=82-32=50\)