Răspuns :
a)4√10 -2√8 -(6+4√10)=
=4√10 -4√2 -6 -4√10=
=-4√2-6 =-2(2√10 +3)
b)2(4+√21)-6√7 +2√7 * (3-√3)=
=8 +2√21 -6√7 +6√7 -2√21=
=2√21 -2√21 +8=
=8
c)4√3(√8 -√3) -2√3 *(3√3-√2)=
=4√24 -4*3 -2*3*3 +2√6=
=4* 2√6 -12 -18 +2√6=
=8√6 -30 +2√6=
=10√6 -30= 10(√6 -3)
=4√10 -4√2 -6 -4√10=
=-4√2-6 =-2(2√10 +3)
b)2(4+√21)-6√7 +2√7 * (3-√3)=
=8 +2√21 -6√7 +6√7 -2√21=
=2√21 -2√21 +8=
=8
c)4√3(√8 -√3) -2√3 *(3√3-√2)=
=4√24 -4*3 -2*3*3 +2√6=
=4* 2√6 -12 -18 +2√6=
=8√6 -30 +2√6=
=10√6 -30= 10(√6 -3)
1) 4√10 - 2√8 - (6 + 4√10) = 4√10 - 2√8 - 6 - 4√10= -2√8 - 6
2) 2(4+ √21) - 6√7 +2√7(3-√3)= 8+ 2√21 - 6√7 + 6√7 - 2√21 = 8
3) 4√3(√8 - √3) - 2√2( 3√3 - √2 ) = 4√3(2√2 - √3) -6√6 +4 = 8√6 - 12 -6√6 +4 = 2√6 - 8 = 2(√6-4)
Bafta :)
2) 2(4+ √21) - 6√7 +2√7(3-√3)= 8+ 2√21 - 6√7 + 6√7 - 2√21 = 8
3) 4√3(√8 - √3) - 2√2( 3√3 - √2 ) = 4√3(2√2 - √3) -6√6 +4 = 8√6 - 12 -6√6 +4 = 2√6 - 8 = 2(√6-4)
Bafta :)