3x-6y-5=0,求 2x-4x+6的值
人气:282 ℃ 时间:2020-02-06 08:40:35
解答
3x-6y-5=0
3(x-2y)=5
x-2y=5/3
2x-4y+6
=2(x-2y)+6
将x-2y=5/3代入得
=2*(5/3)+6
=10/3+6
=28/3
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