问题
填空题
将4个数a，b，c，d排成2行、2列，两边各加一条竖直线记成
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答案
由题意可得：（x+1）（x+1）-（1-x）（x-1）=4，
即：2x2=2
即x2=1
解得x1=-1，x2=1，
∴x=-1或1．
故答案为1或-1．
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将4个数a，b，c，d排成2行、2列，两边各加一条竖直线记成
|
由题意可得：（x+1）（x+1）-（1-x）（x-1）=4，
即：2x2=2
即x2=1
解得x1=-1，x2=1，
∴x=-1或1．
故答案为1或-1．
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