(a-b) ^2 = a^2-2ab+b^2
{(+4)÷(-2)}×(-2)
kx - 2y + z = 1 x - 2ky + z = 2 x - 2y + kz = 1
(+44
6/5-2/11-4/15
65-/1
9+4equals*
81^3*27^8*9^8/3^51-18^12:3^23*12^8/24^9
9334 divide by 717