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needmoney_hp2007200120072001
2 năm trước
B1: Tìm x, y, z biết: {x^2}.y.z= -2 x.{y^2}.z= 2 x.y.{z^2}= -4 B2:Tìm a, b, c biết: a.b=2 b.c=6 a.c=3 B3: Biết A=x^2.y.z B=x.y^2.z C=x.y.z^2 và x+y+z=1 Chứng minh: A+B+C=x.y.z giúp em với vội lắm rồi ạ Luu y: dấu ^ là bình phương nnha
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