Question

初一下的数学题！！急求啊啊啊—— 求等式-100(x-1)²=（-4）³ 中x的值

Answer 1

•     -100(x-1)^2=(-4)^3

• 解:-100(x-1)^2=-64

•             (x-1)^2=0.64

•             ±( x-1)=sqrt(0.64)

•             ±( x-1)=0.8

•                 x=1.8或x=0.2
  

Answer 2

解方程 -100(x-1)²=(-4)³
解：由原式得100(x-1)²=4³=64，故(x-1)²=64/100，x-1=±(8/10)=±(4/5)
于是得x₁=1+(4/5)=9/5；x₂=1-4/5=1/5.

Answer 3

-100(x-1)²=（-4）³
-100(x-1)²=-64
(x-1)²=0.64
x-1=正负0.8
X1=1.8 X2=0.2

Answer 4

• -100x+100=-64

-100x=-64-100

         =-164

x=-164/-100

   =1.64

Answer 5

-100(x-1)^2=(-4)^3
(x-1)^2=4^3/100=(2^2)^3/100=(2^3)^2/10^2=[2^3/10]^2=[8/10]^2=[4/5]^2
x-1=4/5 或 x-1=-4/5
x=9/5 或 x=1/5

追问

虽然很感谢你的帮忙，但是没怎么看懂....

追答

就把平方数拆开，然后化简

Answer 6

9-5x=0或5x-1=0 x=9/5或x=1/5