1000 - 47 . 72 - 47 .28

= 47 . ( 1000 - 72 -28 )

= 47 .0

=0

3457 - 27 . 48 - 48 .73 + 6543

=3457 - 48 . (27 + 73 ) + 6543

= 3457 - 4800 + 6543

= 5200

a) \(\left(145\times99+145\right)-\left(143\times102-143\right)\)

\(=\left[145\times\left(99+1\right)\right]-\left[143\times\left(102-1\right)\right]\)

\(=\left(145\times100\right)-\left(143\times101\right)\)

\(=14500-14443\)

\(=57\)

b) \(54\times47-47\times53-20-27\)

\(=47\times\left(54-53\right)-20-27\)

\(=47-20-27\)

\(=0\)

c) \(10000-47\times72-47\times28\)

\(=10000-47\times\left(72+28\right)\)

\(=10000-47\times100\)

\(=10000-4700\)

\(=5300\)

d) \(3457-27\times48-48\times73+6543\)

\(=\left(3457+6543\right)-48\times\left(27+73\right)\)

\(=10000-48\times100\)

\(=10000-4800\)

\(=5200\)

a) 10000 - 47 . 72 - 47 . 28

= 10000 - 47 ( 72 - 28 )

= 10000 - 47 . 44

= 10000 - 2068

= 7932

b) 3457 - 27 . 48 - 48 . 73 + 6543

= 3457 - 48 ( - 27 - 48 ) + 6543

= 3457 - 48 . ( - 75 ) + 6543

= 3457 - ( - 27 ) + 6543

= 3457 + 27 + 6543

= 10027

a, 10000-47×72-47×28

= 10000-47(72+28)

=10000-47×100

=10000-4700= 5300

a/ 1000 - 47 x 72 - 47 x 28

= 1000 - 47 x (72 + 28)

= 1000 - 47 x 100

= 1000 - 4700

= -3700

b/ 3457 - 27 x 48 - 48 x 73 + 6543

= 3457 - 48 x (27 + 73) + 6543

= (3457 + 6543) - 48 x 100 

= 10000 - 4800

= 5200

k mk nha, mk trả lời đầu tiên đấy

dễ tự là

c)(145x99+145)-(143x102-143)

   =   145x(99+1)-143x(101-1)

    =  145x100-143x100

      =     (145-143)x100

       =           2x100

          =          200

3457 - 27 x 48 - 48 x 73 + 6543

=3457 - 48 x ( 27 + 73) + 6543

=3457 - 48 x 100 + 6543

=(3457+ 6543) - 4800

=10000- 4800

=5200

(10000 - 47)x (72 - 47 )x (28 - 3547 - 27 )x( 48 - 48) x (73 + 6543)

kết quả =0 ,vì (48-48)=0 mà nhân 0 với bất cứ số nào thì kết quả cũng bằng 0

 bằng 3496

a) 6*1235*20-5*235*24 = 120(1235-235)=120.1000=120000

b) =[145*99+145*1]-[143101*1]=145*[99+1]-145*[101-1]=145*100-143*100=100*[145-143]=100*2=200

= 5200

tick cho mk nhé