用开平方法解方程:(x-1)的平方-8=0
\u7528\u76f4\u63a5\u5f00\u5e73\u65b9\u6cd5\u89e3\u65b9\u7a0b:2(x-1)\u7684\u5e73\u65b9-8=02(x-1)\u7684\u5e73\u65b9-8=0
2(x-1)\u7684\u5e73\u65b9=8
\uff08x-1\uff09²=4
\u4e24\u8fb9\u5f00\u65b9\u5f97\uff1a
x-1=2 \u6216 x-1= -2
\u6240\u4ee5\uff1a
x=3 \u6216 x= -1
\u6709\u4e0d\u660e\u767d\u7684\u53ef\u4ee5\u8ffd\u95ee\uff01\u8c22\u8c22\uff01\uff01
\u795d\u5b66\u4e60\u8fdb\u6b65
(x-2)^2 - 9(x+1)^2 = 0
(x-2)^2 - [3(x+1)]^2 = 0
\u7531\u5e73\u65b9\u5dee\u516c\u5f0f\u5f97\uff1a[(x-2) + 3(x+1)][(x-2) - 3(x+1)] = 0
\u6574\u7406\u5f97\uff1a(4x + 1)(-2x - 3) = 0
\u6240\u4ee5x = -1/4 \u6216 -3/2
(x-1)的平方=8
x-1=±2√2
x=1±2√2
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