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一、填空题 1．在-1/2x,1/n+2,2/x-3/y,2/x-3/y,3x~2+1/3y~3,2/x+2-(y-2)~2,2x/π+2中,属于分式的是 2．在分式4x/x~2-1中．当x____时,它有意义；在分式|x|-3/x~2+3x中．当x____时．分式的值为0． 3．化简：-x/x~2-3x·(x~2-6x+9)=____． 4．若x-1/x=6,则x~2+/x~2的值为____． 5．某油库有汽油 mL,计划每天用去nL,实际用油每天节约了dL,那么这些油可以用____天,比原计划多用____天． 6．当x=____时、代数式1/x+2的值比代数式1-x/2+x的值小2．
First, fill in the blank 1. At -1/2x, 1/n+2, 2/x-3/y, 2/x-3/y, 3x~2+1/3y~3, 2/x+2-(y-2)~ In 2,2x/π+2, the fractional formula is 2. In fractional 4x/x~2-1. When x____, it makes sense; in the fraction |x|-3/x~2+3x. When x____. Fractional value is 0. 3. Simplification: -x/x~2-3x(x~2-6x+9)=____. 4. If x-1/x=6, the value of x~2+/x~2 is ____. 5. An oil depot has a volume of gasoline mL, plans to use nL every day, the actual use of oil to save dL per day, then these oils can be used _____ days, more than the original plan __ days. 6. When x=____, the value of algebraic expression 1/x+2 is smaller than the value of algebraic expression 1-x/2+x.