题目(1)(1)(1)计算:−12−∣1−2∣+25−(2)2+−83-{1}^{2}-|1-\sqrt{2}|+\sqrt{25}-{(\sqrt{2})}^{2}+\sqrt[3]{-8}−12−∣1−2∣+25−(2)2+3−8；(2)(2)(2)求下列各式xxx的值.①4x2−25=04x^{2}-25=04x2−25=0；②27(x−2)3−8=027\left(x-2\right)^{3}-8=027(x−2)3−8=0.知识点：平方根章节：数与式 / 无理数与实数
