x+x+(x倍根号2)=4

问题描述:

x+x+(x倍根号2)=4

即(1+1+√2)x=4
x=4/(2+√2)
=4(2-√2)/(2+√2)(2-√2)
=4(2-√2)/(4-2)
=2(2-√2)
即x=4-2√2