X-3/20X=18.7

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X-3/20X=18.7X-3/20X=18.7X-3/20X=18.7x-3分之2加上3-x分之1=2/(x-3)+1/(3-x)=2/(x-3)-1/(x-3)=1/(x-3)x-3分之2加上3-

X-3/20X=18.7
X-3/20X=18.7

X-3/20X=18.7
x-3分之2加上3-x分之1
=2/(x-3)+1/(3-x)
=2/(x-3)-1/(x-3)
=1/(x-3)

x-3分之2加上3-x分之1 =2/(x-3) 1/(3-x) =2/(x-3)-1/(x-3) =1/(x-3) 通分,得(3-x)(3x-2) 3/3(3-x) 自己化简 .

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