みと 約3年以前 ¹⁰Ｂの存在比を(x)％とすると、¹¹Ｂの存在比が(100－x)％となる事から 10.0×{x/100}＋11.0×{(100－x)/100}＝10.8 方程式を解いて、x＝20 ¹⁰Ｂの存在比は(20)％ 留言
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