宸茬煡鍏充簬x镄勪竴鍏冧簩娆℃柟绋媥虏-(1+2k)x+k虏-2=0链変袱涓疄鏁版牴锛屼竴娆″嚱鏁
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宸茬煡鍏充簬x镄勪竴鍏冧簩娆℃柟绋媥虏-(1+2k)x+k虏-2=0链変袱涓疄鏁版牴锛屼竴娆″嚱鏁宸茬煡鍏充簬x镄勪竴鍏冧簩娆℃柟绋媥虏-(1+2k)x+k虏-2=0链変袱涓Ⱦ
宸茬煡鍏充簬x镄勪竴鍏冧簩娆℃柟绋媥虏-(1+2k)x+k虏-2=0链変袱涓疄鏁版牴锛屼竴娆″嚱鏁
宸茬煡鍏充簬x镄勪竴鍏冧簩娆℃柟绋媥虏-(1+2k)x+k虏-2=0链変袱涓疄鏁版牴锛屼竴娆″嚱鏁
宸茬煡鍏充簬x镄勪竴鍏冧簩娆℃柟绋媥虏-(1+2k)x+k虏-2=0链変袱涓疄鏁版牴锛屼竴娆″嚱鏁
有两个实数根.△=(2k+1)²-4(k²-2)>=0
4k²+4k+1-4k²+8>=0
4k>=-9
k>=-9/4
y=kx+1递减,K