\(A=\frac{1.5.6+1.5.6.2^3+1.5.6.3^3+1.5.6.4^3+1.5.6.5^3}{1.3.5+1.3.5.2^3+1.3.5.3^3+1.3.5.4^3+1.3.5.5^3}\)

\(=\frac{1.5.6.\left(1+2^3+3^3+4^3+5^3\right)}{1.3.5.\left(1+2^3+3^3+4^3+5^3\right)}\)

\(=\frac{1.5.6}{1.3.5}=\frac{1.5.3.2}{1.3.5}=2\)

\(A=\frac{\text{1.5.6 + 2.10.12 + 3.15.18 + 4.20.24 + 5.25.30}}{\text{1.3.5 + 2.6.10 + 3.9.15 + 4.12.20 + 5.15.25 }}\)

\(=\frac{1.5.6+2.\left(1.5.6\right)+3.\left(1.5.6\right)+4.\left(1.5.6\right)+5.\left(1.5.6\right)}{1.3.5+2.\left(1.3.5\right)+3.\left(1.3.5\right)+4.\left(1.3.5\right)+5.\left(1.3.5\right)}\)

\(=\frac{30.\left(1+2+3+4+5\right)}{15.\left(1+2+3+4+5\right)}\)

\(=\frac{30}{15}=2\)

Vậy A=2.

Bấm máy tính

A=\(\dfrac{1.5.6+2.\left(1.5.6\right)+3.\left(1.5.6\right)+4.\left(1.5.6\right)+5.\left(1.5.6\right)}{1.3.5+2.\left(1.3.5\right)+3.\left(1.3.5\right)+4.\left(1.3.5\right)+5.\left(1.3.5\right)}\)

A=\(\dfrac{\left(1+2+3+4+5\right).\left(1.5.6\right)}{\left(1+2+3+4+5\right).\left(1.3.5\right)}\) = \(\dfrac{1.5.6}{1.3.5}\) = 2

bang 2 nhé

\(\frac{1\cdot5\cdot6+2\cdot10\cdot12+4\cdot20\cdot24+9\cdot45\cdot54}{1\cdot3\cdot5+2\cdot6\cdot10+4\cdot12\cdot20+9\cdot27\cdot45}=\frac{1\cdot5\cdot6\cdot\left(1+2+4+9\right)}{1\cdot3\cdot5\cdot\left(1+2+4+9\right)}=2\)

\(A=\frac{1.5.6+2.10.12+4.20.24+9.45.54}{1.3.5+2.6.10+4.12.20+9.27.45}\)

\(A=\frac{1.5.6.\left(1^3+2^3+4^3+9^3\right)}{1.3.5.\left(1^3+2^3+4^3+9^3\right)}=2\)

\(A=\frac{1\cdot5\cdot6+2\cdot10\cdot12+4\cdot20\cdot24+9\cdot45\cdot54}{1\cdot3\cdot5+2\cdot6\cdot10+4\cdot12\cdot20+9\cdot27\cdot45}\)

\(A=\frac{1\cdot5\cdot6\cdot\left(1+2+4+9\right)}{1\cdot3\cdot5\cdot\left(1+2+4+9\right)}\)

\(A=\frac{1\cdot5\cdot6}{1\cdot3\cdot5}\)

\(A=2\)

\(A=\frac{3.24.2}{13}=\frac{144}{13}\)

\(A=\frac{3.24.2}{13}=\frac{144}{13}\)

nha bn

k mik nha thanks

\(A=\frac{1.5.6+2^3.1.5.6+4^3.1.5.6+9^3.1.5.6}{1.3.5+2^3.1.3.5+4^3.1.3.5+9^3.1.3.5}=\frac{1.5.6.\left(1+2^3+4^3+9^3\right)}{1.3.5.\left(1+2^3+4^3+9^3\right)}=2\)

S=\(\frac{1.5.6+2.10.12+4.20.24+9.45.54}{1.3.5+2.6.10+4.12.20+9.27.45}\)=\(\frac{1.5.6+1.5.6.8+1.5.6.64+1.5.6.729}{1.3.5+1.3.5.8+1.3.5.64+1.3.5.729}\)

S=\(\frac{1.5.6.\left(8+64+729\right)}{1,3,5,\left(8+64+729\right)}\)=\(\frac{30}{15}\)=2

Duyệt mình đi nhé các bạn

chỗ mà 1,3,5 là 1.3.5 đó mình nhấn nhầm mong các bạn thông cảm