Răspuns :
a) 4√7-3+2√7+7=
=√7(4+2)-3+7
=6√7+4
=2(3√7+2)
b) 3√13+5-√13-6
=√13(3-1)+5-6
=2√13-1
c) 0,1√2-3√2-3,2√2
=√2(0,1-3-3,2)
=√2×(-6,1)
=-6,1×1,4142=
= - 8,62662
d) -6√5-9√6+9√5
=√5(9-6)-9√6
=3√5-9√6
=3(√5-3√6)
=√7(4+2)-3+7
=6√7+4
=2(3√7+2)
b) 3√13+5-√13-6
=√13(3-1)+5-6
=2√13-1
c) 0,1√2-3√2-3,2√2
=√2(0,1-3-3,2)
=√2×(-6,1)
=-6,1×1,4142=
= - 8,62662
d) -6√5-9√6+9√5
=√5(9-6)-9√6
=3√5-9√6
=3(√5-3√6)