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最佳答案:2分之X-19=2-7分之2X+31 (x-19) / 2 =2 -(2x+31)/7 7(x-19) =28 -2(2x+31) 7x-133=28-4x-6
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最佳答案:解题思路:由(x-19)(x-90)=p,得(x-19)(x-90)-p=0,方程(x-19)(x-90)=p有实根r1,r2,说明(x-19)(x-90)-p
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最佳答案:(5x-96)/(x-19)+(x-8)/(x-9)=(4x-19)/(x-6)+(2x-21)/(x-8)5-1/(x-19)+1+1/(x-9)=4+5/(