共50条信息
下列各式\(\dfrac{x-y}{3}\),\(\dfrac{a}{2x-1}\),\(\dfrac{x}{\pi +1}\),\(\dfrac{2}{x}+y-\dfrac{3a}{b}\),\(\dfrac{1}{2}x+y\)中,分式的个数为________个.
食堂有煤\(m\)吨,原计划每天烧煤\(a\)吨,现每天节约用煤\(b(b < a)\)吨,则这批煤比原计划多烧_____天.
下列式子是分式的是( ).
在代数式\(\dfrac{2}{3}x\),\(\dfrac{3x}{x+4}\),\(\dfrac{3{{x}^{2}}-5}{2x}\),\(\dfrac{1}{2}x-\dfrac{1}{3}y\),\(2-\dfrac{1}{x}\),\(\dfrac{{{x}^{2}}}{x}\),\(\dfrac{2}{\mathrm{ }\!\!\pi\!\!{ }}\)中,其中分式共有\((\) \()\).
若分式\(\dfrac{1-b}{2{{b}^{2}}+1}\)的值是负数,则\(b\)满足\((\) \()\).
使分式\(\dfrac{-2\pi }{1-3x}\)的值为正的条件是\((\) \()\)
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