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3x 2y 5z 2

x=4,y=1 1ʽ x-y=3 2ʽ x+y=5 2ʽ-1ʽ y=1 2ʽ+1ʽ x=4 (2)2x+y=32 2x+y=0 -3/7, 22/7 0, 5 1, 1

Ŷ

Ϊ 11 7x+2y-5z 117x+2y-5z*2 7x+2y-5z*2 =14x+4y-10z Ϊ x,y,zΪ x+y-2zΪ 11 11*x+y-2z 11*x+y-2z=11x+11y-22z Ϊ 7x+2y-5z*2-11*x+y-2z=3x-7y+12z 113x-7y...

12ⷽȥyõһxzģ23ȥyҲõһxzġȻͻ

2x+y+z=0, 1 3x+2y+5z=0 2 12-2 x-3z=0 x=3z x=3z루1 6z+y+z=0 y=-7z x²-5z²+7xy/2x²-y²+2z²-4xy =9z²-5z²-147z²/18z²-49z²+2z²+84z²...

7x+2y-5z=11m߳214x+4y-10z=22m 13x+4y+12z=n 22-1-11x+22z=n-22m-11x-2z=n-22m11ın-22mҲ11ınҲ11ı3x+4y+12z110ʱΪ0

== Ǹ ѧĺ˵

⣺ (3x+2y-5z+1)(-3x+2y-5z-1) =[(2y-5z)+(3x+1)][(2y-5z)-(3x+1)] =(2y-5z)²-(3x+1)² =4y²-20yz+25z²-9x²-6x-1

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