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maidangtien85
2 năm trước
Tìm giá trị của m sao cho: a) Phương trình (2x+1)( 9x+2m)-5(x+2)=40 có nghiệm x=2 b) Phương trình $x^{3}$ +m$x^{2}$ -4$x^{}$ -4=0 có một nghiệm x=1 Với giá trị m vừa tìm được, tìm các nghiệm của phương trình c) Tìm k để hai phương trình sau tương đương: (2$x^{}$ +1)($x^{2}$ +4x+5)=0 và 5x+3k=$k^{2}$ +10$k^{}$ -$\frac{5}{2}$
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