=(x²-2)²-2(x²-2)2+2²=((x²-2)-2)²=(x²-2-2)²=(x²-4)²=(x²-2²)²=((x-2)(x+2))²=(x-2)²(x+2)²=(x-2)(x-2)(x+2)(x+2)
-2/9- 1 - 8/9=-(2/9+8/9+1)=-(10/9+1)=-(1 1/9 + 1)=- 2 1/9
<span>625:25+17= 25 + 17 = 42
144 : 12 + 83 = 12 + 83 = 95
21 * 7 = 147
84 : 2 = 42
(9 + 10) * 5 = 19 * 5 = 95
(160 + 9) : 13 = 169 : 13 = 13
12 * 12 + 3 = 144 + 3 = 147
(37 + 2) : 3 = 39 : 3 = 13</span>