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a, \(108^2-92^2=\left(108-92\right)\left(108+92\right)=16.200=3200\)
c, \(31^2-31.22+11^2=31^2-2.31.11+11^2=\left(31-11\right)^2=20^2=400\)
a: \(108^2-92^2=3200\)
b: \(102^2+128\cdot26-27^2=9675+3328=13003\)
c: \(31^2-31\cdot22+11^2=20^2=400\)
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a: \(73^2-27^2=\left(73-27\right)\left(73+27\right)=100\cdot46=4600\)
b: \(37^2-17^2=\left(37-17\right)\left(37+17\right)=20\cdot54=1080\)
c: \(2002^2-2^2=\left(2002-2\right)\left(2002+2\right)=2004\cdot2000=4008000\)
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a) 732 - 272
= ( 73 + 27 ) ( 73 - 27 )
= 100 . 46
= 4600
b) 372 - 132
= ( 37 + 13 ) ( 37 - 13 )
= 50 . 24
= 1200
c) 20022 - 22
= ( 2002 + 2 ) ( 2002 - 2 )
= 2004 . 2000
= 4008000
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1. Phuc will look through a new English book tomorrow.
2. Which ethnic group has the largest population in Vietnam?
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a) 732 - 272
= (73 - 27)(73 + 27)
= 46 . 100
= 4600
b) 372 - 132
= (37 - 13)(37 + 13)
= 24 . 50
= 1200
c) 20022 - 22
= (2002 - 2)(2002 + 2)
= 2000 . 2004
= 4008000
a ) 732 - 272 = 432
b ) 372 - 132 = 242
c ) 20022 - 22 = 19982
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Bài giải:
a) 732 – 272 = (73 + 27)(73 – 27) = 100 . 46 = 4600
b) 372 - 132 = (37 + 13)(37 – 13) = 50 . 25 = 100 . 12 = 1200
c) 20022 – 22 = (2002 + 2)(2002 – 2) = 2004 . 2000 = 400800
![](https://rs.olm.vn/images/avt/0.png?1311)
872+732-272-132
=(872-132)+(732-272)
=(87+13)(87-13)+(73+27)(73-27)
=100.74+100.46
=100.(74+46)
=100.120
=12000
letrunghieu sai
câu c bạn viết thiếu mjk viết lại
a)73^2 - 27^2
=(73+27)(73-27)
=100.46
=4600
b)37^2 - 13^2
=(37+13)(37-13)
=50.24
=1200
c)2002^2 - 2^2
=(2002+2)(2002-2)
=2004.2000
=4008000