共50条信息
已知\(\dfrac{x}{2}=\dfrac{y}{3}=\dfrac{z}{4}\ne 0\),求\(\dfrac{{{x}^{2}}-{{y}^{2}}+2{{z}^{2}}}{xy+yz+xz}\)的值.
已知\(\dfrac{a}{2}=\dfrac{b}{3}\ne 0\),求代数式\(\dfrac{5a-2b}{a+2b}\)的值.
已知:\(\dfrac{x}{3}=\dfrac{y}{4}=\dfrac{z}{5}\),求\(\dfrac{x-y-z}{x+y+z}\)的值.
已知:\(\dfrac{x}{2}=\dfrac{y}{4}=\dfrac{z}{5}\ne 0\),求\(\dfrac{x+2y-z}{2x-y+3z}\)的值.
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