【分式的加减】计算题(1)(x+y / x-y)+(2x / y-x)=(2)(2x / x ² -y
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【分式的加减】计算题
(1)(x+y / x-y)+(2x / y-x)=
(2)(2x / x ² -y ² )+(3x / y ² -x ² )+【x / (x+y)(y-x)】=
(3)(x ² -x-2 / x+3)÷(2-x)+(x+1 / x+3)=
(1)(x+y / x-y)+(2x / y-x)=
(2)(2x / x ² -y ² )+(3x / y ² -x ² )+【x / (x+y)(y-x)】=
(3)(x ² -x-2 / x+3)÷(2-x)+(x+1 / x+3)=
![【分式的加减】计算题(1)(x+y / x-y)+(2x / y-x)=(2)(2x / x ² -y](/uploads/image/z/17983708-52-8.jpg?t=%E3%80%90%E5%88%86%E5%BC%8F%E7%9A%84%E5%8A%A0%E5%87%8F%E3%80%91%E8%AE%A1%E7%AE%97%E9%A2%98%EF%BC%881%EF%BC%89%EF%BC%88x%2By+%2F+x-y%EF%BC%89%2B%EF%BC%882x+%2F+y-x%EF%BC%89%3D%EF%BC%882%EF%BC%89%EF%BC%882x+%2F+x+%26%23178%3B+-y+%26%231)
1)(x+y / x-y)+(2x / y-x)
=(x+y)/(x-y)-2x/(x-y)
=(x+y-2x)/(x-y)
=(y-x)/(x-y)
=-1
(2)(2x / x ² -y ² )+(3x / y ² -x ² )+【x / (x+y)(y-x)】
=2x/(x²-y²)-3x/(x²-y²)-x/(x²-y²)
=(2x-3x-x)/(x²-y²)
=-2x/(x²-y²)
(3)(x ² -x-2 / x+3)÷(2-x)+(x+1 / x+3)
=(x²-x-2)/(x+3)(2-x)+(x+1)/(x+3)
=(x²-x-2)/(x+3)(2-x)+(x+1)(2-x)/(x+3)(2-x)
=(x²-x-2+2x+2-x²-x)/(x+3)(2-x)
=0/(x+3)(2-x)
=0
=(x+y)/(x-y)-2x/(x-y)
=(x+y-2x)/(x-y)
=(y-x)/(x-y)
=-1
(2)(2x / x ² -y ² )+(3x / y ² -x ² )+【x / (x+y)(y-x)】
=2x/(x²-y²)-3x/(x²-y²)-x/(x²-y²)
=(2x-3x-x)/(x²-y²)
=-2x/(x²-y²)
(3)(x ² -x-2 / x+3)÷(2-x)+(x+1 / x+3)
=(x²-x-2)/(x+3)(2-x)+(x+1)/(x+3)
=(x²-x-2)/(x+3)(2-x)+(x+1)(2-x)/(x+3)(2-x)
=(x²-x-2+2x+2-x²-x)/(x+3)(2-x)
=0/(x+3)(2-x)
=0
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