分式加减法计算⑴ 5/6xy - 2/3xz + 3/4xyz ⑵ 【(x^5-x³y²)/(y^4
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分式加减法计算
⑴
5/6xy - 2/3xz + 3/4xyz
⑵
【(x^5-x³y²)/(y^4)】·(1/x²y²)³ - (x+y)/y³
⑴
5/6xy - 2/3xz + 3/4xyz
⑵
【(x^5-x³y²)/(y^4)】·(1/x²y²)³ - (x+y)/y³
1)5/6xy - 2/3xz + 3/4xyz
=10z/(12xyz)-8y/(12xyz)+9/(12xyz)
=(10z-8y+9)/(12xyz)
2)【(x^5-x³y²)/(y^4)】·(1/x²y²)³ - (x+y)/y³
=(x^5-x^3y^2)/(y^4x^6y^6)-(x+y)/y^3
=(x^2-y^2)/(x^3y^10)-(x+y)/y^3
=(x+y)/y^3*((x-y)/(x^3y^7))
=10z/(12xyz)-8y/(12xyz)+9/(12xyz)
=(10z-8y+9)/(12xyz)
2)【(x^5-x³y²)/(y^4)】·(1/x²y²)³ - (x+y)/y³
=(x^5-x^3y^2)/(y^4x^6y^6)-(x+y)/y^3
=(x^2-y^2)/(x^3y^10)-(x+y)/y^3
=(x+y)/y^3*((x-y)/(x^3y^7))
分式加减法计算⑴ 5/6xy - 2/3xz + 3/4xyz ⑵ 【(x^5-x³y²)/(y^4
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