解方程:①(x-1)²-4=21②(x-0.6)³=0.064③-100(x-1)²=(-4)³

问题描述:

解方程:①(x-1)²-4=21②(x-0.6)³=0.064③-100(x-1)²=(-4)³

  1. (x-1)2=25     x-1=5     x=6     或x-1=-5  x=-4

  2. (x-0.6)=0.4   x=1

  3. (x-1)2=0.64   x-1=0.8   x=1.8  或x-1=-0.8 x=0.2

①(x-1)²-4=21
(x-1)²=25
x-1=±5
x=1±5
所以x1=6 x2=﹣4
②(x-0.6)³=0.064
x-0.6=₃√0.064
x-0·6=0·4
x=1
③-100(x-1)²=(-4)³
-100(x-1)²=﹣64
100(x-1)²=64
(x-1)²=64/100
x-1=±4/5
x=1±4/5
x1=9/5 x2=1/5
不懂的还可以追问!满意请及时采纳! O(∩_∩)O

①(x-1)²-4=21
(x-1)²=25
x-1=±5
∴x₁=6
x₂=-4

②(x-0.6)³=0.064
x-0.6=0.4
x=1

③-100(x-1)²=(-4)³
-100(x-1)²=-64
(x-1)²=64/100
x-1=±8/10
∴x₁=1/5
x₂=9/5

①(x-1)²=25 x-1的绝对值为5,x=6或-4
②x-0.6=0.8 x=1.4
③(x-1)²=0.64 x-1的绝对值为0.8,x=1.8或0.2
还满意吗