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.
人气:298 ℃ 时间:2020-02-04 06:37:59
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.
推荐
猜你喜欢
- 负三分之一的x的m+1次方乘y乘负三分之一的x的2-m次方乘y的n-1次方
- It is generally accepted that [ ] boy must learn to stand up and fight like [ ] man
- ______ cups of tea do you need?A.How many B.How much C.How D.what
- 一弧长为18.84cm,圆心角为270°,这弧的半径为几cm
- how to be true to yourself是什么文体
- I live with my mum,dad and grandma in a small honse in Edinburgh,in the north of England.
- 问下课堂上老师正在津津有味地讲数学题,你的同桌却向你...会的人说下嘛,感谢了5b
- 对于整数a,b,c,d,符号|a b|表示运算ac-bd.|d c