解方程4(2-x)²=9
问题描述:
解方程4(2-x)²=9
答
4(2-x)²=9
4(4-4x x²)=9
16-16x 4x²=9
(4-2x)²=9
4-2x=3或4-2x=-3
2x=1或2x=7
x=1/2或x=7/2
望采纳 纯手打
答
4(2-x)²=9
4(4-4x+x²)=9
4x²-16x+16-9=0
4x²-16x+7=0
(2x-7)(2x-1)=0
x=7/2,
x=1/2
答
4(2-x)²=9
(x-2)²=9/4
x=2±3/2
则x1=7/2,x2=1/2