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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
![](https://rs.olm.vn/images/avt/0.png?1311)
\(166.\left(-127+234\right)-234.\left(166+127\right)\)
\(=\)\(166.107-234.293\)
\(=\)\(17762-68562\)
\(=\)\(-50800\)
\(53.39+47.39-53.21-47.21\)
\(=\)\(39.\left(53+47\right)-21.\left(53+47\right)\)
\(=\)\(39.100-21.100\)
\(=\)\(100.\left(39-21\right)\)
\(=\)\(100.18\)
\(=\)\(1800\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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
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234 + 28 - ( -234 ) + ( -108 ) + 120=234+28+234-108+120
=234+(108+120)-28=234+(228-28)
=234+200=434
625 - ( 127 - 56 ) + ( 144 - 625 )=625-127+56+144-625
=127+(625-625)+(144+56)=127+0+200
=127+200=327
Cho mk xin lỗi bài mk sai nha bn
Lời giải:
$234+28-(-234)+(-108)+120=234+28+234-108+120$
$=234.2-(108-28)+120$
$=468-80+120=468+40=508$
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$625-(127-56)+(144-625)=625-127+56+144-625$
$=(625-625)+(144+56)-127$
$=0+200-127=73$
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(-1089-234\right)+\left(1089-166\right)\)
\(=-1089-234+1089-166\)
\(=\left(-1089+1089\right)-\left(234+166\right)\)
\(=0-400\)
\(-400\)
Chúc bạn học tốt~~!!! :3
\(\left(-1089-235\right)+\left(1089-166\right)\)
\(=-1089-234+1089-166\)
\(=\left(-1089+1089\right)-\left(234+166\right)\)
\(=0-400\)
\(=-400\)
CHÚC BẠN HỌC TỐT.
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a)2575-57-2584+47
=(2575-2585)-(57-47)
=(-10)-10
=-20
b)123-234+177-166
=(123+177)-(234+166)
=300-400
=-100
Bài này mới đúng nè :
166 * ( – 127 + 234 ) – 234 * ( 166 +127 )
= [166 . (-127) + 166 . 234] - [234 . 166 + 234 . 127]
= 166 . (-127) + 166 . 234 - 234 . 166 - 234 . 127
= 127 . (-166) - 127 . 234
= 127 . (-166 - 234)
= 127 . (-400)
= -50800
= 166 . (-127) + 166 . 234 - 234 . 166 + 234 . 127
= -166 . 127 + 124 . 127
= 127 . (-166 + 124)
= 127 . (-42)
= -5334