数学题,高智商奥数题,谁敢来挑战?
2个回答
展开全部
原方程化简得
1-1/(x+2)+1-1/(x+7)=1-1/(x+3)+1-1/(x+6)
即1/(x+2)+1/(x+7)=1/(x+3)+1/(x+6)
1/(x+2)-1/(x+3)=1/(x+6)-1/(x+7)
[(x+3)-(x+2)]/[(x+2)(x+3)]=[(x+7)-(x+6)]/[(x+6)(x+7)]
1[(x+2)(x+3)]=/[(x+6)(x+7)]
(x+6)(x+7)=(x+2)(x+3)
x²+13x+42=x²+5x+6
13x-5x=6-42
8x=-36
x=-4.5
1-1/(x+2)+1-1/(x+7)=1-1/(x+3)+1-1/(x+6)
即1/(x+2)+1/(x+7)=1/(x+3)+1/(x+6)
1/(x+2)-1/(x+3)=1/(x+6)-1/(x+7)
[(x+3)-(x+2)]/[(x+2)(x+3)]=[(x+7)-(x+6)]/[(x+6)(x+7)]
1[(x+2)(x+3)]=/[(x+6)(x+7)]
(x+6)(x+7)=(x+2)(x+3)
x²+13x+42=x²+5x+6
13x-5x=6-42
8x=-36
x=-4.5
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询