Question

Tolong bantuan nya nomor 18-20 pakai cara ya..

Answer 1

No. 18
8/2√5+4
=8/2√5+4 x 2√5-4/2√5-4
=16√5-32/20-16
=16√5-32/4
=4√5-8(C)
no.19
4/6-2√8
=4/6-2√8 x 6+2√8/6+2√8
=24+8√8/36-32
=24+8√8/4
=6+2√8(C)
no.20
√27-√20=3√3-2√5=3p-2q(A)