Rasionalkan 1 - √2 / 1 + √2 = Yg jago mtk tolong bantu yaa

mungkin jawabannya kaya gini
1-√2/1+√2 adalah 1

1-√2/1+√2 = 1-√2/1+√2 x 1-√2/1-√2
= (1-√2)²/(1+√2)(1-√2)
= (1 - 2√2 + 2)/1-2
= (-1-2√2)/-1
= -(1+2√2)/-1
= 1+2√2