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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)
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
![](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
![](https://rs.olm.vn/images/avt/0.png?1311)
B= 53.39+47.39+53.21-47.21
= ( 53+47).39 + (53+47).21
= 100.39+100.21
= 100.(39+21)= 100.60=6000
tich cho minh nha
![](https://rs.olm.vn/images/avt/0.png?1311)
\(53.39+47.39+53.21+47.21\)
\(=53\left(39+21\right)+47\left(39+21\right)\)
\(=53.60+47.60\)
\(=60\left(53+47\right)\)
\(=60.100\)
\(=6000.\)
Theo Thắng làm như sau : 53.39+47.39+53.21+47.2153.39+47.39+53.21+47.21
=53(39+21)+47(39+21)=53(39+21)+47(39+21)
=53.60+47.60=53.60+47.60
=60(53+47)=60(53+47)
=60.100=60.100
=6000.
![](https://rs.olm.vn/images/avt/0.png?1311)
\(53.39+47.39-53.21-47.21\)
\(=53\left(39-21\right)+47\left(39-21\right)\)
\(=\left(39-21\right).\left(53+47\right)\)
\(=18.100\)
\(=1800\)
![](https://rs.olm.vn/images/avt/0.png?1311)
53.39-47.39-53.21-47.21
=(39.(53-47))-(21.(53-47))
=234-126
=108
![](https://rs.olm.vn/images/avt/0.png?1311)
đề bài đúng rồi nhá bn Nguyễn Ngọc Quý. Cách giải như sau:
= 39.(53+47)-21.(53+47)
= 39.100-21.100
= (39-21).100
= 18.100+1800
(bn ơi ''tick'' cho mk với nhé)
\(166.\left(-127+234\right)-234.\left(166+127\right)\)
\(=\)\(166.107-234.293\)
\(=\)\(17762-68562\)
\(=\)\(-50800\)
\(53.39+47.39-53.21-47.21\)
\(=\)\(39.\left(53+47\right)-21.\left(53+47\right)\)
\(=\)\(39.100-21.100\)
\(=\)\(100.\left(39-21\right)\)
\(=\)\(100.18\)
\(=\)\(1800\)