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

=  ( - 237 ) . 26 + 26 . 137

= 26 . [ ( -237 ) + 137 ]

= 26 . ( -100 )

= -2600

b) 63 . ( -25 ) + 25 . ( -23 )

= ( -63 ) . 25 + 25 . ( -23 )

= 25 . [ ( -63 ) + ( -23 ) ]

= 25 . ( -86 )

= -2150

63.(-25)+25.(-23)

=(-63).25+25.(-23) 

=25.[(-63)+(-23)]

=25.(-86)

=-2150  

63 . (-25) = (-63) . 25

=> 25 . ( -63 + 23 )

= 25 . -40

= -1000 

63 . (-25) + 25 . (-23)=63.-23.(-25)+25=63.-23.0=0

a) (37 - 17) . (-5) + 23 . (-13 - 17)

= 20 . (-5) + 23 . (-30)

= (-100) + (-690)

= -790

b) 63 . ( - 25 ) + 25 . (-23)

= (-63) . 25 + 25 . (-23)

= 25[(-63) + (-23)]

= 25 . (-86)

= -2150

a: =100x26=2600

b: =78x10=780

c: =67x100=6700

d: =1000x575=575000

\(4\times26\times25=\left(4\times25\right)\times26=100\times26=2600\\ 63\times78-53\times78=\left(63-53\right)\times78=10\times78=780\\ 67\times92+67\times8=67\times\left(92+8\right)=67\times100=6700\\ 8\times23\times25\times125=\left(8\times125\right)\times\left(23\times25\right)=1000\times575=57500\)

a: =100x26=2600

b: =78x10=780

c: =67x100=6700

d: =1000x575=575000

= -237. 26 + 26. 137

26.( - 237 + 137 )

=26.  (-100)

= -2600

a) 237.(-26) + 26.137

= -237.26 + 26.137

= 26.(-237 + 137)

= 26.(-100)

= -2600

b) 63.(-25) + 25.(-23)

= -63.25 + 25.(-23)

= 25.(-63 - 23)

= 25.(-86)

= -2150

=63 . (-25 ) + (-25).23

-25 .(63+ 23)

-25 . 86

= -2150

22.23=(20+2).23=460+46=506

44.101=44(100+1)=4400+44=4444

25.105=25(100+5)=250+125=375