Răspuns :
a) (√10×√90:√50)²-(√90-√40)²=
=(√900:√50)²-[(√90)²-2√90×√40+(√40)²]=
=(√18)²-(90-2√3600+40)=
=18-(90-2×60+40)=
=18-(90-120+40)=
=18-(-30+40)=
=18-10=8
a) (√10×√90:√50)²-(√90-√40)²=
=(√900:√50)²-[(√90)²-2√90×√40+(√40)²]=
=(√18)²-(90-2√3600+40)=
=18-(90-2×60+40)=
=18-(90-120+40)=
=18-(-30+40)=
=18-10=8