求满足下列各式的未知数x:(1)x²=121 (2)(x-1)²=256
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求满足下列各式的未知数x:(1)x²=121 (2)(x-1)²=256
求满足下列各式的未知数x:(1)x²=121 (2)(x-1)²=256
求满足下列各式的未知数x:(1)x²=121 (2)(x-1)²=256
(1)x=±11
(2)x-1=±16 x=17或-15
(1)x²=121
两边同时开平方根
x的绝对值=11
x=正负11
(2)(x-1)²=256
两边同时开平方根
(x-1)的绝对值=16
x-1=正负16
x1=17 x2=-15