x的平方加2x等于负1,问x等于多少? x 的平方等于负一 问x等于多少
x\u7684\u5e73\u65b9\u52a02x\u51cf\u4e00\u7b49\u4e8e1,x\u600e\u4e48\u6c42?\u9996\u5148\u5047\u8bbe\u7b49\u4e8e0
x²+2x-1\uff1dx²+2x-2+1
\uff08x+1)²-2\uff1d0
\uff08x+1)²\uff1d2
x+1\uff1d\u00b1\u221a2
x\uff1d\u00b1\u221a2-1
\u4e3a\u865a\u6570i\uff0c\u7ed9\u4f60\u7b54\u6848\u4e3a\u65e0\u89e3\u7684\u77e5\u5546\u4e0d\u591f\u3002
x的平方加2x等于负1(x+1)平方等于零
x=-1
x²+2x=-1
x²+2x+1=0
(x+1)²=0
x+1=0
x=-1
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