1.已知Y1=6-X,Y2=2+7X (1)若Y1的值与Y2的值相等,求X的值 (2)当X取何值时,Y1比Y2小-3(3)当X取何值时,Y1与Y2互为相反数
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![1.已知Y1=6-X,Y2=2+7X (1)若Y1的值与Y2的值相等,求X的值 (2)当X取何值时,Y1比Y2小-3(3)当X取何值时,Y1与Y2互为相反数](/uploads/image/z/6854777-17-7.jpg?t=1.%E5%B7%B2%E7%9F%A5Y1%3D6-X%2CY2%3D2%2B7X+%EF%BC%881%EF%BC%89%E8%8B%A5Y1%E7%9A%84%E5%80%BC%E4%B8%8EY2%E7%9A%84%E5%80%BC%E7%9B%B8%E7%AD%89%2C%E6%B1%82X%E7%9A%84%E5%80%BC+%EF%BC%882%EF%BC%89%E5%BD%93X%E5%8F%96%E4%BD%95%E5%80%BC%E6%97%B6%2CY1%E6%AF%94Y2%E5%B0%8F-3%EF%BC%883%EF%BC%89%E5%BD%93X%E5%8F%96%E4%BD%95%E5%80%BC%E6%97%B6%2CY1%E4%B8%8EY2%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0)
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1.已知Y1=6-X,Y2=2+7X (1)若Y1的值与Y2的值相等,求X的值 (2)当X取何值时,Y1比Y2小-3(3)当X取何值时,Y1与Y2互为相反数
1.已知Y1=6-X,Y2=2+7X (1)若Y1的值与Y2的值相等,求X的值 (2)当X取何值时,Y1比Y2小-3
(3)当X取何值时,Y1与Y2互为相反数
1.已知Y1=6-X,Y2=2+7X (1)若Y1的值与Y2的值相等,求X的值 (2)当X取何值时,Y1比Y2小-3(3)当X取何值时,Y1与Y2互为相反数
1,因为Y1=Y2,所以6-X=2+7X,所以X=0.5
2,因为Y1=Y2-3,所以6-X=2+7X-3,所以X=7/8
3,以为Y1=-Y2,所以6-X=-(2+7X),所以X=1
计算过程都给你了,
(1)若Y1的值与Y2的值相等,求X的值
6-x=2+7x
8x=4
x=1/2
(2)当X取何值时,Y1比Y2小-3
6-x=2+7x-(-3)
6-x=5+7x
8x=-1
x=-1/8
(3)当X取何值时,Y1与Y2互为相反数
6-x=-(2+7x)
6-x=-2-7x
7x-x=-2-6
6x=-8
x=-4/3
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