9.1-根号2的相反数是?绝对值是?倒数是?10.若根号2x+6+y-2的绝对值+根号z-5=0,则4x+y-9z=?

9. 1-根号2的相反数是√2-1,绝对值是√2-1,倒数是√2+110. 若根号2x+6+y-2的绝对值+根号z-5=0,则2x+6=0,y-2=0,z-5=0x=-3,y=2,z=5∴4x+y-9z=-12+2-45=-5511.当-1＜x＜0时,x的绝对值+根号1+2x+x的平方=-x+│1+x│=...