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9975+11970+13965+15960+17955+19950 phần 1995+3990+5985+7980+9975
=(9975+13965)+(11970+15960+19950)+17955 phần (1995+5985)+(3990+7980)+9975
=23940+47880+17955 phần 7980+11970+9975
=89775 phần 29925
=3
![](https://rs.olm.vn/images/avt/0.png?1311)
(9975+11970+13965+15960+17955+19950):(1995+3990+5985+7960+9975)= 199599730
![](https://rs.olm.vn/images/avt/0.png?1311)
=(9975+25)+(11970+30)+(13965+35)+(17955+45)+(19950+50)-(25+30+35+45+50)
= 10000+12000+14000+18000+20000-185
=73815
9975 + 11970 + 13965 + 17955 + 19950
= 9975 + ( 11970 + 19950 ) + ( 13965 + 17855 )
= 9975 + 31020 + 31820
= 9975 + ( 31020 + 31820 )
= 9975 + 62840
= 72815
thấy đúng thì tick mik nha hok tốt
mik cũng ko nghĩ mik đúng
![](https://rs.olm.vn/images/avt/0.png?1311)
9975 + 11970 + 13965 + 15960 + 17955 + 19950
=9975+13965+17955+11970+15960+19950
=9970+13960+17950+11970+15960+19950+15
=17950+19950+(9970+11970)+(13960+15960)+15
=37900+21940+29920+15
=59840+29920+15
=89760+15
=89775
![](https://rs.olm.vn/images/avt/0.png?1311)
= (9975+25)+(11970+30)+(13965+35)+(17955+45)+(19950+50)-(25+30+35+45+50)
= 10000+12000+14000+18000+20000-185
= 73815
\(\frac{855}{89}\)