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a) 166.(-127)+166.234+(-234).166-234.127
166.(-234+234)+127.(-166-234)
=0+127.(-400)
=-50800
b) 53.39+43.39-53.21-47.21
=39.(53+43)+(-21).(53+47)
=39.96+(-21).100
=-1644
k cho minh
a, -234-(123-234)
=-234-123+234
=(-234+234)-123
=0-123
-123
b, -24 . 33+ 40 . 24 +13 . 30 +13 . 46
= 24x(-33+40)+13(30+46)
=24.7+13.76
=98+988
=1086
c, 34 . (-84)+ 17 . (-32)
=34.(-84-16)
=34.-100
=-3400
a, -234-(123-234)
= -234-123+234
= (-234+234)-123
= 0-123
= -123
b, -24 . 33+ 40 . 24 +13 . 30 +13 . 46
= 24 . ( -33 ) + 40 . 24 + 13 . 30 + 13 . 46
= 24 . [ -33 + 40 ] + 13 . [ 30 + 46 ]
= 24 . 7 + 13 . 76
= 168 + 988
= 1156
166.(-127+234)-234.(166+127)
= 166.(-127)+166.234-234.166-234.127
=[166.(-127)-234.127]+(166.234-234.166)
=(-127).(166+234)+0
=(-127).400
=-50800
\(166.\left(-127+234\right)-234.\left(166+127\right)\)
\(=\)\(166.107-234.293\)
\(=\)\(17762-68562\)
\(=\)\(-50800\)
\(53.39+47.39-53.21-47.21\)
\(=\)\(39.\left(53+47\right)-21.\left(53+47\right)\)
\(=\)\(39.100-21.100\)
\(=\)\(100.\left(39-21\right)\)
\(=\)\(100.18\)
\(=\)\(1800\)
a: \(-81\cdot36+\left(-81\right)\cdot63-81\)
\(=36\cdot\left(-81\right)+63\cdot\left(-81\right)+\left(-81\right)\)
\(=-81\left(36+63+1\right)\)
\(=-81\cdot100=-8100\)
b: \(23\cdot\left(-38+123\right)-123\cdot\left(23-38\right)\)
\(=-23\cdot38+23\cdot123-123\cdot23+123\cdot38\)
\(=123\cdot38-23\cdot38=38\left(123-23\right)=38\cdot100=3800\)
a)2575-57-2584+47
=(2575-2585)-(57-47)
=(-10)-10
=-20
b)123-234+177-166
=(123+177)-(234+166)
=300-400
=-100
a)2575-57-2584+47
=(2575-2585)-(57-47)
=-10-10