mn rảnh giúp mik nha!

`\text{a) a*x*x + b*x + c}`

`\text{b)(a*a + b)*(1+c)*(1+c)*(1+c)}`

`\text{c) a+c/b*d}`

`\text{d)15*a+30/b+12}`

`\text{Theo kí hiệu pascal ta có}`

`+ = +`

`- = -`

`\text{x = * }`

`\text{ : = /}`

`\text{a^2 = a*a}`