题目内容
(1)计算:(-
)-1+(-2)2×
+
(2)解方程:x2-2x-4=0
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(2)解方程:x2-2x-4=0
(1)原式=-3+4×
+
=-2+
(2)x2-2x=4,
x2-2x+1=5,
(x-1)2=5,
x-1=±
,
∴x1=1+
,x2=1-
.
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(2)x2-2x=4,
x2-2x+1=5,
(x-1)2=5,
x-1=±
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∴x1=1+
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