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11.72 + 9.22.8 + 18.67.4
=11.72 + 72.22 + 72.67
=(11+22+67).72
=100.72
=7200
11 . 72 + 9 . 22 . 8 + 18 . 67 . 4
= 11 . 72 + 9 . 8 . 22 + 18 . 4 . 67
= 11 . 72 + 72 . 22 + 72 . 67
= 72 . ( 11 + 22 + 67 )
= 72 . 100
= 7200
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a,21.7^2-11.7^2+90.7^2+49.125.16
=7^2.(21-11+90)+49.(2.125.8)
=49.100+49.2000
=49.(100+2000)
=49.2100
=102900
![](https://rs.olm.vn/images/avt/0.png?1311)
21.72-11.72+90.72+49.125.16
=21.49-11.49+90.49+49.2000
=(21-11+90+2000).49
=2100.49
=102900
21.72-11.72+90.72+49.125.16
=21.49-11.49+90.49+49.2000
=(21-11+90+2000).49
=2100.49
=102900
![](https://rs.olm.vn/images/avt/0.png?1311)
21.72-11.72+90.72+49.125.16
=21.72-11.72+90.72+72.2000
=(21-11+90+2000).72
=2100.49
=102900
![](https://rs.olm.vn/images/avt/0.png?1311)
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A,35*34+35*86+65*75+65*45
=35*[34+86]+65*[75+45]
=35*100+65*120
=35*100+65*100+65*20
=[35+65]*100+65*20
=10000+1300=11300