已知关于x的方程6分之一ax加2
(1/6)ax+ (3/2) = (5/6)x - 2
(1/6)ax - (5/6)x = -7/2
ax - 5x = -21
(a-5)x = -21
x是正的, 所以(a-5)是负的
0< a < 5
-21 = -3 x 7 或是 3 x -7 或是 -1 x 21 或是 1 x -21
a - 5 = -3,a = 2
a - 5 = -7,a = 12(太大了)
a - 5 = -1,a = 4
a - 5 = -7,a = -2(太小了)
所以 a = 2,x = 7;a = 4,x = 21
两边乘以6得ax+9=5x-12,化简得(a-5)x=-21
所以x=1时,a=...全部
(1/6)ax+ (3/2) = (5/6)x - 2
(1/6)ax - (5/6)x = -7/2
ax - 5x = -21
(a-5)x = -21
x是正的, 所以(a-5)是负的
0< a < 5
-21 = -3 x 7 或是 3 x -7 或是 -1 x 21 或是 1 x -21
a - 5 = -3,a = 2
a - 5 = -7,a = 12(太大了)
a - 5 = -1,a = 4
a - 5 = -7,a = -2(太小了)
所以 a = 2,x = 7;a = 4,x = 21
两边乘以6得ax+9=5x-12,化简得(a-5)x=-21
所以x=1时,a=-16(舍)
x=3时,a=-2(舍)
x=7时,a=2
x=21时,a=4
谢谢。
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