若x+2y-9z=0,z-3y-5z=0,(xyz≠0)求:x²-4y²+9z²分之(2x²+3y²+7z²)若x+2y-9z=0,z-3y-5z=0,(xyz≠0),求:(x²-4y²+9z²)分之(2x²+3y²+7z²)的值.
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若x+2y-9z=0,z-3y-5z=0,(xyz≠0)求:x²-4y²+9z²分之(2x²+3y²+7z²)若x+2y-9z=0,z-3y
若x+2y-9z=0,z-3y-5z=0,(xyz≠0)求:x²-4y²+9z²分之(2x²+3y²+7z²)若x+2y-9z=0,z-3y-5z=0,(xyz≠0),求:(x²-4y²+9z²)分之(2x²+3y²+7z²)的值.
若x+2y-9z=0,z-3y-5z=0,(xyz≠0)求:x²-4y²+9z²分之(2x²+3y²+7z²)
若x+2y-9z=0,z-3y-5z=0,(xyz≠0),求:(x²-4y²+9z²)分之(2x²+3y²+7z²)的值.
若x+2y-9z=0,z-3y-5z=0,(xyz≠0)求:x²-4y²+9z²分之(2x²+3y²+7z²)若x+2y-9z=0,z-3y-5z=0,(xyz≠0),求:(x²-4y²+9z²)分之(2x²+3y²+7z²)的值.
x+2y-9z=0 ①
x-3y-5z=0 ② 第一个应该是你打错x为z了
①-②得
5y-4z=0
y=4z/5
代入②得
x-3*4z/5-5z=0
x=12z/5+5z=37z/5
从而x∶y∶z=37z/5∶4z/5∶z=37∶4∶5
令x=37k y=4k z=5k,于是
(1369k²-64k²+225k²)分之(2*1369k²+48k²+7*25k²)
=(1369-64+225)分之(2738+48+175)
=1530分之2961
=170分之329
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若x+2y-9z=0,z-3y-5z=0,(xyz≠0)求:x²-4y²+9z²分之(2x²+3y²+7z²)若x+2y-9z=0,z-3y-5z=0,(xyz≠0),求:(x²-4y²+9z²)分之(2x²+3y²+7z²)的值.
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