中考试
题
快递公司问题件快递公司问题件货款处理关于圆的周长面积重点题型关于解方程组的题及答案关于南海问题
一、填空题
11(当x______时,有意义( x,1
12( 当 时,分式无意义( x,x,22aa,23(化简的结果是 a
22mmnn,,444(化简: ( ,22mn,4
22xyxy,,5(化简:,_______ 1,,22xyxxyy,,,369
2xxx,,446. 化简: ( ,,2xx,,42
217(分式方程的解是_________ ,31xx,
x,18. 已知分式的值为0,那么的值为______________。 xx,1
2xx,,29( 若分式的值为0,则的值等于 ( x2xx,,21
21xx,10( 化简: ( ,,xx,,11
2xx11(将分式化简得,则x应满足的条件是________( 2x,1xx,
ab,22ab,,012( 设,,则的值等于 ( abab,,,60ba,
yxxy、m,,13. 若实数满足xy,0,则的最大值是 ( xy
ab11,14 .a、b为实数,且ab=1,设P=,Q=,则P Q ,ab,,11ab,,11
(填“,”、“,”或“,”)(
1a,,15. 计算= . 1,,,,2aa,,11,,
1225350xx,,,16(已知,则,__________( 52xx,,2525xx,,
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二、选择题
11 .要使分式有意义,则应满足的条件是( ) xx,1
(x,1 B(x,,1 C(x,0 D(x,1 A
2ba(a,),2 .化简的结果是 aa,b
11a,ba,bA( B( C( D( a,ba,b
2aaa4,,,3. 化简的结果是( ) ,,,,aaa,2,2,,
A(,4 B(4 C(2a D(,2a
,,11,,4. 化简的结果是( ) yx,,,,,,,xy,,,,
xxyy,,A( B( C( D( xxyy
115. 分式的计算结果是( ) ,aaa,,1(1)
1a1a,1A( B( C( D( aa,1a,1a
6(下列公式中是最简分式的是( )
22222xy,xy,2()ab,12b A( B( C( D( 2ba,27axy,xy,
111nm7(已知+=,则+等于( ) mnmn,mn
A(1 B(-1 C(0 D(2
32(2)(1)1xx,,,,28(已知x-5x-1 997=0,则代数式的值是( ) x,2
A(1 999 B(2 000 C(2 001 D(2 002
xx,2419(先化简,再求值:,其中. (),,x,,322xxx,,,244
a,11a,,,,10(先化简,,再选一个使原式有意义的值代入求值. ,,2a,1a,1a,2a,1,,
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