tolongin dong cara nya gmn no 6&7 ya please

6 kalo Ngk sala 4.............

semoga membantu dan bermanfaat
6. [tex] \sqrt{20- \sqrt{11+ \sqrt{25} } }= \sqrt{20- \sqrt{11+5} }= \sqrt{20- \sqrt{16} } [/tex] = [tex] \sqrt{20-4}= \sqrt{16}=4 [/tex]
7. m = -2 ; n = 8 ; k = 9 → 3n²-5m²k = 3(8)²-5(-2)²9=3(64)-5.4.9=192-180=12