1〜20の二乗↓(覚えましょー！)
1,4,9,16,25,36,49,64,81,100,121,144,169,196,225,256,289,324,361,400
ここで150は144(12の二乗)と169(13の二乗)の間になるので、ルート150は12,・・・となります(´∀｀)
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