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2 năm trước
Tính giúp mình bài này câu c nha Cho phuong trình x mũ 2 -mx-1=0(m là tham số) A chứng minh phương trình luôn luôn có nghiệm với mọi giá trị của m B tính tổng và tích của hai nghiệm theo m C gọi x1 ,x2 là hai nghiệm của phương trình, tìm m để có x1 mũ2 +x2 mũ2 -x1-x2 =12
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