Tính: 63.(-25) + 25.(-23)
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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
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63.(-25)+25.(-23)
=(-63).25+25.(-23)
=25.[(-63)+(-23)]
=25.(-86)
=-2150
63 . (-25) = (-63) . 25
=> 25 . ( -63 + 23 )
= 25 . -40
= -1000
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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
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a: =100x26=2600
b: =78x10=780
c: =67x100=6700
d: =1000x575=575000
\(4\times26\times25=\left(4\times25\right)\times26=100\times26=2600\\ 63\times78-53\times78=\left(63-53\right)\times78=10\times78=780\\ 67\times92+67\times8=67\times\left(92+8\right)=67\times100=6700\\ 8\times23\times25\times125=\left(8\times125\right)\times\left(23\times25\right)=1000\times575=57500\)
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22.23=(20+2).23=460+46=506
44.101=44(100+1)=4400+44=4444
25.105=25(100+5)=250+125=375
63 . (–25) + 25 . (–23)
= – 63 . 25 + 25 . (–23)
= 25. [–63 + (–23)]
= 25. (–86) = – (25.86) = –2150