超简单分式计算,送分,在线求助[(x^2+9x)/(x^2+3x)]+[(x^2-9)/(x^2+6x+9)]要有过程才
4个回答
x(x+9)/x(x+3)+(x+3)(x-3)/(x+3)^2
=(x+9)/(x+3)+(x-3)/(x+3)
=(2x+6)/(x+3)
=2
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