-31.94-(-94).131
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131 \(\times\) \(x\) - 94 = 128 \(\times\) 8
131 \(\times\) \(x\) - 94 = 1024
131 \(\times\) \(x\) = 1024 + 94
131 \(\times\) \(x\) = 1118
\(x\) = 1118 : 131
\(x\) = \(\dfrac{1118}{131}\)
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( -131 ) . ( -25 ) + ( -74 ) . 131 - ( -1 ) . 131
= 131 . 25 + ( -74 ) . 131 - ( -1 ) . 131
= 131 . [ ( 25 + ( -74 ) - ( -1 ) ]
= 131 . ( -50 )
= -6550
\(\left(-131\right)\left(-25\right)+\left(-74\right).131-\left(-1\right).131\)
\(=\left(-131\right)\left[\left(-25\right)+74-1\right]=\left(-131\right).48=-6288\)
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TL
Chứng minh rằng: (x – y)(x4 + x3y + x2y2 + xy3 + y4) = x5 – y5
HT
k nick trọng có ny nha nick này ko cần k nhá :)
Giải thích các bước giải:
(x−y)(x4+x3y+x2y2+xy3+y4)(x-y)(x4+x3y+x2y2+xy3+y4)
=x5+x4y+x3y2+x2y3+xy4−x4y−x3y2−x2y3–xy4−y5=x5+x4y+x3y2+x2y3+xy4-x4y-x3y2-x2y3–xy4-y5
=x5−y5(đpcm)
![](https://rs.olm.vn/images/avt/0.png?1311)
( -215 + 131 + 57 ) - ( 131 - 215 +47 )
= -215 + 131 + 57 - 131 + 215 - 47
= ( -215 + 215 ) + ( 131 - 131 ) + ( 57 - 47 )
= 0 + 0 + 10
=10
mk giải xong rồi nhớ tick mk nha
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12.( -131-25)+131.( 12+25)
= -12.131-12.25+131.12+131.25
= -12.25+131.25
= 25.( 131-12)
= 25.119
= 2975
#Châu's ngốc
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=4\cdot\left(\frac{1}{17}-\frac{1}{49}-\frac{1}{131}\right):3\cdot\left(\frac{1}{17}-\frac{1}{49}-\frac{1}{131}\right)=\frac{4}{3}\)
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-31.94-(-94).131
= -31 . 94 + 94 . 131
= ( -31 + 131 ) x 94
= 100 x 94
= 9400
Ta có
\(-31.94-\left(-94\right).131\)
\(=-31.94+94.131\)
\(=94.\left(-31+131\right)\)
\(=94.100\)
\(=9400\)
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