\(2\cdot3\cdot12+4\cdot6\cdot42+8\cdot27\cdot3\\=(2\cdot12)\cdot3+(4\cdot6)\cdot42+(8\cdot3)\cdot27\\=24\cdot3+24\cdot42+24\cdot27\\=24\cdot(3+42+27)\\=24\cdot(45+27)\\=24\cdot72\\=1728\)
#\(Toru\)
2.3.12+4.6.42+8.27.3
Tính hợp lí
1+3+5+7+9+...+2015
1+2+3+4+...N
100+98+96+..+2-97-95-...-1
2.3.12+4.6.42+8.27.3
Tính:
2.3.12+4.6.12+8.27.3?
Tính nhanh:
a) 2.3.12 + 4.6.42 + 8.27.3
b) 100 + 98 + 96 + ....+ 2 - 97 - 95 - ....-1
2.31.12+4.6.42+8.27.3
2.31.12+4.6.42+8.27.3
2.31.12+4.6.42+8.27.3 = ?
Tính nhanh: 2.31.12 + 4.6.42 + 8.27.3
2.31.12+4.6.42+8.27.3
