Có 3 thằng lùn xếp hàng dọc đi vào hang. Thằng đi sau cầm 1 cái xô, thằng đi giữa cầm 1 cái xẻng, hỏi thằng đi trước cầm gì?
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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
![](https://rs.olm.vn/images/avt/0.png?1311)
30 ngày xưởng đó sản xuất được số bộ bàn ghế là
12*30 =360 bộ bàn ghế
xưởng đó dệt xong có số ngày là
360 / 18 = 20 ngày
đáp số : 20 ngày
nhớ cho một đúng nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
thằng đi trước cầm ĐẦU VÌ NÓ LÀ ĐẠI CA
Thằng đó/"cầm đầu/"tức là đại ca cầm đầu,nó ko phải cầm vật gì hết