Jawab ya ada tambahan poin :):):)
Bab Operasi Bilangan
Matematika SMP Kelas VII
1] 2 + 4 + 6 = 6 + 6
= 12
2] 2 + 4 + 6 + 8 = 6 + 14
= 20
3] 2 + 4 + 6 + 8 + 10 = 6 + 14 + 10
= 30
4] 2 + 4 + 6 + 8 + 10 + …. + 100 = ?
banyak bilangan = 100/2
= 50
jumlah seluruh = 50/2 x (bilangan awal + bilangan akhir)
= 25 x (2 + 100)
= 25 x 102
= 2.550
5] (-2) + (-4) + (-6) = – (2 + 4 + 6)
= – 12
6] (-2) + (-4) + (-6) + (-8) = – (2 + 4 + 6 + 8)
= – 20
7] (-2) + (-4) + (-6) + (-8) + ….. + (-100) = – (2 + 4 + 6 + 8 + … + 100)
= – 2.550