9 dan 10 pakai caraaaa buat besok

rata" nilai = (5×4)+(6×5)+(7×9)+(8×6)+(9×10)+(10×6)
= 20+30+63+48+90+60
= 311 : ( banyak siswa )
= 311 : 40
= 7,77

no 9.cara = 4×5=20
=5×6=30
=9×7=63
=6×8=48
=10×9=90
=6×10=60
jumlah = 30+63+48+90+60=93+138+60=231+60=291÷4+5+9+6+10+6 = 291÷40 = 7,275
no 10. cara =360'-(45'+108'+135')
=360'-288' = 72'
=360'/12×8 = 40 orang
( tanda ' menandakan derajat)