已知方程3(5x-6)=3-20x的解也是方程3a-10x=6a+30x的解,求a的值.
已知方程3(5x-6)=3-20x的解也是方程3a-10x=6a+30x的解,求a的值.
数学人气:886 ℃时间:2020-02-04 06:37:59
优质解答
去括号得3(5x-6)=3-20x,
15x-18=3-20x,
15x+20x=3+18,
35x=21,
x=
,
把x=
代入方程3a-10x=6a+30x得3a-10×
=6a+30×
,
3a-6=6a+18,
解得a=-8.
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