若xyz≠0,且x+2y-7z=0,4x-3y-6z=0,求x²+5y²+7z²分之2x&
1个回答
这题简单啊
根据已知条件可以得出
x=3z
y=2z
代入公式可以得:2x²+3y²+6z²=36z²
x²+5y²+7z²=36z²
所以原式=1
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