计算化简

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2 | 2012-8-10 17:54:50 | 显示全部楼层 |阅读模式

解：通分，最简公分母是2a(a+3)(a-3) 原式=(a-5)/[2a(a+3)]+ (3a2-9)/[(a+3)(a-3)]-3=(a-5)(a-3)/[2a(a+3)(a-3)] +2a(3a2-9)/[2a(a+3)(a-3)] -6a(a+3)(a-3)/[2a(a+3)(a-3)]=[(a-5)(a-3)+2a(3a2-9)-6a(a+3)(a-3)]/[2a(a+3)(a-3)]=(a2-8a+15+6a3-18a-6a3+54a)/[2a(a+3)(a-3)]=(a2-28a+15)/(2a3-18a)...

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