1.分式m+3/m-2与分式1/m²-4的最简公分母是( ) A、m-2 B、m²-4 C、m+2
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1.分式m+3/m-2与分式1/m²-4的最简公分母是( ) A、m-2 B、m²-4 C、m+2 D.(m-2)(m²-4)
2.通分:1/x²-x,-1/x²-2x+1
3.若分式2a/a+b的a、b的值同时扩大到原来的10倍,则此分式的值( )
A是原来的20倍 B是原来的10倍 C是原来的1/10倍 D不变
4.已知(1/a)-(1/b)=(1/2),则ab/a-b的值是( )
A.1/2 B.-1/2 C.2 D.-2
5.与分式(-x+y)/(-x-y)相等的是( )
A.(x+y)/(-x-y) B.x-y/x+y C.-(x+y)/(x-y) D.x+y/x-y
6.下列等式中,不成立的是( )
A.(x²-y²/x-y)=x-y B.(x²-2xy+y²/x-y)=x-y C.(xy/x²-xy)=(y/x-y) D.(y²-x²/xy)=(y/x-x/y)
7.化简:((x-y)²-1)/(x-y-1)=______.
8.不改变分式的值,把下列各式的分子和分母中各项系数都化为整数.
(1)(0.01x+0.5)/(0.3x-0.04); (2) (1/5x-2y)/(0.3x+y).
2.通分:1/x²-x,-1/x²-2x+1
3.若分式2a/a+b的a、b的值同时扩大到原来的10倍,则此分式的值( )
A是原来的20倍 B是原来的10倍 C是原来的1/10倍 D不变
4.已知(1/a)-(1/b)=(1/2),则ab/a-b的值是( )
A.1/2 B.-1/2 C.2 D.-2
5.与分式(-x+y)/(-x-y)相等的是( )
A.(x+y)/(-x-y) B.x-y/x+y C.-(x+y)/(x-y) D.x+y/x-y
6.下列等式中,不成立的是( )
A.(x²-y²/x-y)=x-y B.(x²-2xy+y²/x-y)=x-y C.(xy/x²-xy)=(y/x-y) D.(y²-x²/xy)=(y/x-x/y)
7.化简:((x-y)²-1)/(x-y-1)=______.
8.不改变分式的值,把下列各式的分子和分母中各项系数都化为整数.
(1)(0.01x+0.5)/(0.3x-0.04); (2) (1/5x-2y)/(0.3x+y).
1.分式m+3/m-2与分式1/m²-4的最简公分母是( B) A、m-2 B、m²-4 C、m+2 D.(m-2)(m²-4)
2.通分:1/x²-x,-1/x²-2x+1 要详细
1/x(x-1)=(x-1)/x(x-1)²
-1/(x-1)²=-x/x(x-1)²
3.若分式2a/a+b的a、b的值同时扩大到原来的10倍,则此分式的值(D )
A是原来的20倍 B是原来的10倍 C是原来的1/10倍 D不变
4.已知(1/a)-(1/b)=(1/2),则ab/a-b的值是( D )
A.1/2 B.-1/2 C.2 D.-2
(b-a)/ab=1/2
ab/(b-a)=2
ab/(a-b)=-2
5.与分式(-x+y)/(-x-y)相等的是(B )
A.(x+y)/(-x-y) B.x-y/x+y C.-(x+y)/(x-y) D.x+y/x-y
(x-y)/(x+y)
6.下列等式中,不成立的是( A )
A.(x²-y²/x-y)=x-y B.(x²-2xy+y²/x-y)=x-y C.(xy/x²-xy)=(y/x-y) D.(y²-x²/xy)=(y/x-x/y)
7.化简:((x-y)²-1)/(x-y-1)=______.
=(x-y-1)(x-y+1)/(x-y-1)=x-y+1
8.不改变分式的值,把下列各式的分子和分母中各项系数都化为整数.
(1)(0.01x+0.5)/(0.3x-0.04); (同乘以100) (2) (1/5x-2y)/(0.3x+y). (同乘以10)
=(x+50)/(30x-4) =(2x-20y)/(3x+10y)
2.通分:1/x²-x,-1/x²-2x+1 要详细
1/x(x-1)=(x-1)/x(x-1)²
-1/(x-1)²=-x/x(x-1)²
3.若分式2a/a+b的a、b的值同时扩大到原来的10倍,则此分式的值(D )
A是原来的20倍 B是原来的10倍 C是原来的1/10倍 D不变
4.已知(1/a)-(1/b)=(1/2),则ab/a-b的值是( D )
A.1/2 B.-1/2 C.2 D.-2
(b-a)/ab=1/2
ab/(b-a)=2
ab/(a-b)=-2
5.与分式(-x+y)/(-x-y)相等的是(B )
A.(x+y)/(-x-y) B.x-y/x+y C.-(x+y)/(x-y) D.x+y/x-y
(x-y)/(x+y)
6.下列等式中,不成立的是( A )
A.(x²-y²/x-y)=x-y B.(x²-2xy+y²/x-y)=x-y C.(xy/x²-xy)=(y/x-y) D.(y²-x²/xy)=(y/x-x/y)
7.化简:((x-y)²-1)/(x-y-1)=______.
=(x-y-1)(x-y+1)/(x-y-1)=x-y+1
8.不改变分式的值,把下列各式的分子和分母中各项系数都化为整数.
(1)(0.01x+0.5)/(0.3x-0.04); (同乘以100) (2) (1/5x-2y)/(0.3x+y). (同乘以10)
=(x+50)/(30x-4) =(2x-20y)/(3x+10y)
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