初一根号计算题!4·(x-1)²-9=0,求x的值(2√2-√32+√50)÷√1/2
问题描述:
初一根号计算题!
4·(x-1)²-9=0,求x的值
(2√2-√32+√50)÷√1/2
答
4(x+1)²-9=0
4(x+1)²=9
(x+1)²=9/4
x+1=±3/2
x1=1/2,x2=-5/2
答
2.5
答
1.(x-1)²-9=0
(x-1)²-9=0
得: ( x-1)²=9
得: x-1=3或x-1=-3
得: x=4或x=-2
2。(2√2-√32+√50)÷√1/2
=(2√2-4√2+5√2)÷(√2/2)
=3√2÷(√2/2)
6=
答
2.5和-0.5 ;原式=(2√2-4√2+5√2)/(0.5√2)=6
答
4·(x-1)²=9
(x-1)²=9/4
x-1=3/2或x-1=-3/2
x=5/2 或x=-1/2
补充问题:
(2√2-√32+√50)÷√1/2
=(2√2-4√2+5√2)÷(√2/2)
=3√2÷(√2/2)
=6