1-6数学题
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(1) 原式=[(3m-5)-(2-m)]/(2m-3)
=(4m-7)/(2m-3).
(2) 原式=[(m+3n)-(m-2n)]/(m^2-n^2)
=(5n/(m^2-n^2).
(3) 原式=[-x(x-y)]*]xy/(x-y)^2]*[(x-y)/x^2]
=-y^2.
(4) 原式=[x+(3x+1)-(2x+3)]/(x^2-1)
=(2x-2)/(x+1)(x-1)
=2-(x+1).
(5) 原式=[x^2-(2x-1)]/(x-1)
=(x-1)^2)/(x-1)
=x-1.
(6) 原式=[3(x-y)+4xy]/[(x-y)-3xy]
=(18xy+4xy)/(6xy-2xy)
=22xy/4xy
=11/2,
=(4m-7)/(2m-3).
(2) 原式=[(m+3n)-(m-2n)]/(m^2-n^2)
=(5n/(m^2-n^2).
(3) 原式=[-x(x-y)]*]xy/(x-y)^2]*[(x-y)/x^2]
=-y^2.
(4) 原式=[x+(3x+1)-(2x+3)]/(x^2-1)
=(2x-2)/(x+1)(x-1)
=2-(x+1).
(5) 原式=[x^2-(2x-1)]/(x-1)
=(x-1)^2)/(x-1)
=x-1.
(6) 原式=[3(x-y)+4xy]/[(x-y)-3xy]
=(18xy+4xy)/(6xy-2xy)
=22xy/4xy
=11/2,
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