`\text{: Đáp Án + Giải Thích Các Bước Giải :}`

$\huge{1.}$

`A=2^2+4^2+6^2+...+16^2+18^2`

`A=(2.1)^2+(2.2)^2+(2.3)^2+...+(2.8)^2+(2.9)^2`

`A=2^2. 1^2+2^2. 2^2 .3^2+...+2^2. 8^2+2^2. 9^2`

`A=2^2.(1^2+2^2+3^2+4^2+...+8^2+9^2)`

`A=2^2 . 285`

`A=1140` (đpcm)

`----------`

$\huge{2}$

`5^x.(1/3)^3=125`

`5^x. 1/27=125`

`5^x=125 : 1/27`

`5^x=125. 27`

`5^x=3375`

`5^x=15^3`

`=>` Phương trình không có giá trị nghiệm nguyên

PS m ktra xem đề đk

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