Tolong bantu pakai cara ya jangan ngasal
Jawaban:
[tex]1. = 165[/tex]
[tex]2. a = 7[/tex]
Penjelasan dengan langkah-langkah:
[tex]1. \: = (10(1) + 3) + (10(2) + 3) + (10(3) + 3) + (10(4) + 3) + (10(5) + 3)[/tex]
[tex] \: \: \: \: \: = (10 + 3) + (20 + 3) + (30 + 3) + (40 + 3) + (50 + 3)[/tex]
[tex] \: \: \: \: \: = 13 + 23 + 33 + 43 + 53[/tex]
[tex] \: \: \: \: \: = 165[/tex]
[tex]2. \: (3(1) - a) + (3(2) - a) + (3(3) - a) + (3(4) - a) + (3(5) - a) + (3(6) - a) + (3(7) - a) = 35[/tex]
[tex] \: \: \: \: \: (3 - a) + (6 - a) + (9 - a) + (12 - a) + (15 - a) + (18 - a) + (21 - a) = 35[/tex]
[tex] \: \: \: \: \: 84 - 7a = 35[/tex]
[tex] \: \: \: \: \: - 7a = 35 - 84[/tex]
[tex] \: \: \: \: \: - 7a = - 49[/tex]
[tex]\: \: \: \: \: a = 7[/tex]
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