5/x+2=5/2x 分式方程- - 已知ab=1 且a不等于0求a/a+1加b/b+1的值 加是加号- -还有这个 2a+1/a²-1乘a²-2a+1/a²-a减1/a+1 乘是乘号.减是减号
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![5/x+2=5/2x 分式方程- - 已知ab=1 且a不等于0求a/a+1加b/b+1的值 加是加号- -还有这个 2a+1/a²-1乘a²-2a+1/a²-a减1/a+1 乘是乘号.减是减号](/uploads/image/z/3769672-40-2.jpg?t=5%2Fx%2B2%3D5%2F2x+%E5%88%86%E5%BC%8F%E6%96%B9%E7%A8%8B-+-+%E5%B7%B2%E7%9F%A5ab%3D1+%E4%B8%94a%E4%B8%8D%E7%AD%89%E4%BA%8E0%E6%B1%82a%2Fa%2B1%E5%8A%A0b%2Fb%2B1%E7%9A%84%E5%80%BC+%E5%8A%A0%E6%98%AF%E5%8A%A0%E5%8F%B7-+-%E8%BF%98%E6%9C%89%E8%BF%99%E4%B8%AA+2a%2B1%2Fa%26%23178%3B-1%E4%B9%98a%26%23178%3B-2a%2B1%2Fa%26%23178%3B-a%E5%87%8F1%2Fa%2B1+%E4%B9%98%E6%98%AF%E4%B9%98%E5%8F%B7.%E5%87%8F%E6%98%AF%E5%87%8F%E5%8F%B7)
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5/x+2=5/2x 分式方程- - 已知ab=1 且a不等于0求a/a+1加b/b+1的值 加是加号- -还有这个 2a+1/a²-1乘a²-2a+1/a²-a减1/a+1 乘是乘号.减是减号
5/x+2=5/2x 分式方程- - 已知ab=1 且a不等于0求a/a+1加b/b+1的值 加是加号- -
还有这个 2a+1/a²-1乘a²-2a+1/a²-a减1/a+1 乘是乘号.减是减号
5/x+2=5/2x 分式方程- - 已知ab=1 且a不等于0求a/a+1加b/b+1的值 加是加号- -还有这个 2a+1/a²-1乘a²-2a+1/a²-a减1/a+1 乘是乘号.减是减号
5/(x+2)=5/2x
10x=5(x+2)
10x=5x+10
x=2
已知ab=1 且a不等于0求a/a+1加b/b+1的值
a/a+1加b/b+1
=[a(b+1)+b(a+1)]/[(a+1)(b+1)]
=(2ab+a+b)/(ab+1+a+b)
=(2×1+a+b)/(1+1+a+b)
=(2+a+b)/(2+a+b)
=1
2a+1/a²-1乘a²-2a+1/a²-a减1/a+1
=(2a+1)/(a+1)(a-1) × (a-1)²/a(a-1) - 1/(a+1)
=(2a+1)/a(a+1) - a/a(a+1)
=(2a+1-a)/a(a+1)
=1/a