(1)/4b·8b/9a^2 (2) xy^3/8c^2d÷xy/2cd^2 (3) a-b/b·ab/2a-2b
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(1)/4b·8b/9a^2 (2) xy^3/8c^2d÷xy/2cd^2 (3) a-b/b·ab/2a-2b
(4)2x-3y·6x-9y/2x^2y^2 (5)1/(y-x)^2·x-y/x+y
(6)/x^2+x÷(x^2-6x+9)
1和4、6打错了,应该是3a/4b·8b/9a^2 和xy/2x-3y·6x-9y/2x^2y^2和x-3/x^2+x÷(x^2-6x+9)
这几题我总算错,所以,这是分式的题(急用!21:00之前希望有答案TAT)
(4)2x-3y·6x-9y/2x^2y^2 (5)1/(y-x)^2·x-y/x+y
(6)/x^2+x÷(x^2-6x+9)
1和4、6打错了,应该是3a/4b·8b/9a^2 和xy/2x-3y·6x-9y/2x^2y^2和x-3/x^2+x÷(x^2-6x+9)
这几题我总算错,所以,这是分式的题(急用!21:00之前希望有答案TAT)
(1) 3a/4b × 8b/9a^2
= 3a×8b/4b×9a²
=2/3a
(2) xy^3/8c^2d÷xy/2cd^2
=xy^3/8c^2d × 2cd^2/xy
=dy²/4c
(3)a-b/b × ab/2a-2b
=a-b/b × ab/2(a-b )
=a/2
(4)xy/2x-3y·6x-9y/2x^2y^2
=xy/2x-3y × 3(2x-3y)/2x^2y^2
= 3/2xy
(5)1/(y-x)^2·x-y/x+y
=1/(x-y)² × x-y/x+y
=1/x²-y²
(6)x-3/x^2+x÷(x^2-6x+9)
=x-3/x(x+1) × 1/ (x-3)²
=1/x(x+1)(x-3)
= 3a×8b/4b×9a²
=2/3a
(2) xy^3/8c^2d÷xy/2cd^2
=xy^3/8c^2d × 2cd^2/xy
=dy²/4c
(3)a-b/b × ab/2a-2b
=a-b/b × ab/2(a-b )
=a/2
(4)xy/2x-3y·6x-9y/2x^2y^2
=xy/2x-3y × 3(2x-3y)/2x^2y^2
= 3/2xy
(5)1/(y-x)^2·x-y/x+y
=1/(x-y)² × x-y/x+y
=1/x²-y²
(6)x-3/x^2+x÷(x^2-6x+9)
=x-3/x(x+1) × 1/ (x-3)²
=1/x(x+1)(x-3)
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