cho tich 32xY .Neu tang Y len 3 don vi thi tich tang bao nhieu
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
so be la ( 180 - 2) : 2 = 89 so lon la 89+2=91 vi hai so le lien tiep cach deu nhau 2 don vi nen hieu cua chung la 2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=1.3+3.5+5.7+...+97.99\)
\(\Rightarrow6A=1.3.6+3.5.\left(7-1\right)+5.7.\left(9-3\right)+...+97+99.\left(101-95\right)\)
\(\Rightarrow6A=1.3.6+3.5.7-1.3.5+5.7.9-3.5.7+...+97.99.101-95.97.99\)
\(\Rightarrow6A=1.3.6+97.99.101-1.3.5\)
\(\Rightarrow6A=3.\left(1+97.33.101\right)\)
\(\Rightarrow2A=1+323301\)
\(\Rightarrow2A=323302\)
\(\Rightarrow A=161651\)
![](https://rs.olm.vn/images/avt/0.png?1311)
20 Ngàn vì thằng mù và ba của thằng điếc là 2 người ma mỗi tô phở là 10 ngàn
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![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có x+y=a+b
(x+y)2=(a+b)2
x2+2xy+y2=a2+2ab+b2
Mà x2+y2=a2+b2
Suy ra 2xy=2ab
Suy ra xy=ab
a2-ab+b2=x2-xy+y2
(a+b)(a2-ab+b2)=(x+y)(x2-xy+y2)
a3+b3=x3+y3
3 lần
Thì tích tăng đúng 3 lần.