Răspuns:
Explicație pas cu pas:
c)
= 6√7-20√63+8√147+36√49 -65√9+26√21=
6√7-20√3²*7 +8√147+36*7 -65+26*√21=
6√7-20*3√7+8√147+252-65+26√21=
6√7-60√78√147+187+26√21=
6√7-60√7+8√147 + 187+26√21=
-54√7+8√7²*3+187+26√21=
-54√7+8*7√3+187 +26√21=
-54√7+56√3+26√21
-
d)
= 84√3-12*3 -8*3 -20√3+30*3 -75√3-42√3+30*3
= 84√3-20√3-75√3-42√3-36-24+90+90
= -53√3+120
