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Toán Lớp 7: cho a+b+c+d=a² +b² +c² +d² = 1 và $\frac{x}{a}$=$\frac{y}{b}$=$\frac{z}{c}$ (a,b,c,d $\neq$0) CMR: (x+y+z)² = x² +y² +z²

Home/ Toán Lớp 7: cho a+b+c+d=a² +b² +c² +d² = 1 và $\frac{x}{a}$=$\frac{y}{b}$=$\frac{z}{c}$ (a,b,c,d $\neq$0) CMR: (x+y+z)² = x² +y² +z²

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