có sai đề ko ạ?

Sửa đề:
\(72\times26+26\times28\)
\(=\left(72+28\right)\times26\)
\(=100\times26\)
\(=2600\)

\(72\times26+36\times48=72\times26+26\times48+480=26\times\left(72+48\right)+480=26\times120+480=26\times120+120\times4=120\times\left(26+4\right)=120\times30=3600\)

a) ( 36 x 28 + 36 x 45 ) : 73

= 36 x (28 + 45 ):73

=36 x 73 :73

= 36 x (73 : 73)

= 36 x 1

= 36

b) ( 98 x 17 - 26 x 17 ) : 72

= 17 x (98-17):72

= 17 x 72 :72

=17 x (72 :72)

= 17 x 1

= 17

a) ( 36 x 28 + 36 x 45 ) : 73 = 36 

b) ( 98 x 17 - 26 x 17 ) : 72 = 17 

Bạn phải giải hẳn ra

a,=\(237.\left(-26\right)+26.137\)

=\(-6162\)\(+3572\)

=\(-2590\)

b,=\(-136+47+36.47\)

=\(47.\left(-136-36\right)\)

=\(47.-100\)

=\(-4700\)

a) 237 . (-26) + 26 . 137

= -237 . 26 + 26 . 137

= 26 . (-237 + 137)

= 26 . -100

= -2600

b) 136 . (-47) + 36 . 47

= -136 . 47 + 36 . 47

= 47 . (-136 + 36)

= 47 . -100

= -4700

c) -48 . 72 + 36 . (-304)

= -48 . 72 + 36 . 2 . (-152)

= -48 . 72 + 72 . (-152)

= 72 . (-48 + -152)

= 72 . -200

= -14400

\(\left(-48\right)\cdot72+36\left(-304\right)\)

\(=36\left(-48\cdot2-304\right)\)

\(=36\cdot\left(-400\right)\)

\(=-14400\)

\(48\left(-21\right)-142\left(-24\right)\)

\(=24\left[2\left(-21\right)+142\right]\)

\(=24\cdot100\)

\(=2400\)

Ta có: \(13\cdot\left(-47\right)-53\cdot13\)

\(=13\cdot\left(-47-53\right)\)

\(=13\cdot\left(-100\right)=-1300\)

Ta có: \(27\cdot\left(-67\right)+33\cdot\left(-27\right)\)

\(=27\cdot\left(-67\right)-33\cdot27\)

\(=27\left(-67-33\right)\)

\(=27\cdot\left(-100\right)=-2700\)

Ta có: \(-49\cdot65+36\cdot\left(-49\right)+49\)

\(=-49\cdot65+\left(-49\right)\cdot36+\left(-49\right)\cdot\left(-1\right)\)

\(=-49\cdot\left(65+36-1\right)\)

\(=-49\cdot100=-4900\)

Ta có: \(136\cdot\left(-47\right)+36\cdot47\)

\(=\left(-136\right)\cdot47+36\cdot47\)

\(=47\cdot\left(-136+36\right)\)

\(=47\cdot\left(-100\right)=-4700\)

Ta có: \(\left(-48\right)\cdot72+36\cdot\left(-304\right)\)

\(=-96\cdot36+36\cdot\left(-304\right)\)

\(=36\cdot\left(-96-304\right)\)

\(=36\cdot\left(-400\right)=-14400\)

= (-48)2.36+36(-304)
= -96.36+36(-304)
= 36(-96-304)
= 36(-400)
= -14400

  9 x 8 x 48 + 7 x 4 x 48 + 72 x 52

=72 x 48 + 28 x 48 + 72 x 52

=( 72 + 28 ) x 48 + 72 x 52

=100 x 48 + 3744

=4800 + 3744

=8544

  9 x 8 x 48 + 7 x 4 x 48 + 72 x 52

=72 x 48 + 28 x 48 + 72 x 52

=( 72 + 28 ) x 48 + 72 x 52

=100 x 48 + 3744

=4800 + 3744

=8544

Hai người này rảnh quá copy bài nhau à 

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

117 x 36 + 117 x 72 - 17 x 72 - 17 x 36

= ( 117 - 17 ) x 36 - ( 117 - 17 ) x 72

= 100 x 36 - 100 x 72

= 100 x ( 36 - 72 )

= 100 x -36

 = -3600

____________________________________

408 x 53 - 5 x 204 - 204

= 408 x 53 - 5 x 204 - 204 x 1

= 408 x 53 - ( 5 - 1 ) x 204

= 408 x 53 - 4 x 204

= 21624 - 816

= 20808

Cảm ơn bạn Đinh Chí Công