Question

星雨

求解，謝謝

Answer 1

imma_idiot

= √((√(x-12)-1)²) + √((√(x-12)+1)²)
= √(x-12)-1 + √(x-12)+1
= 2√(x-12) = 2, x = 13

星雨

x=13我有算出來，但是答案是12<=x<=13