7! + 5!
12² × 5 - 13²
NT : dah pada sahur blm (sahur sahur !!!!)
Penyelesaian :
= 7! + 5!
= ( 7 × 6 × 5 × 4 × 3 × 2 ) + 5!
= 5.040 + 5!
= 5.040 + ( 5 × 4 × 3 × 2 )
= 5.040 + ( 20 × 3 × 2 )
= 5.040 + ( 60 × 2 )
= 5.040 + 120
= 5.160
==================
= 12² × 5 - 13²
= ( 12 × 12 ) × 5 - 13²
= 144 × 5 - 13²
= 144 × 5 - ( 13 × 13 )
= 144 × 5 - 169
= 720 - 169
= 551
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Penjelasan dengan langkah-langkah:
7!+5! = 5.160
7! = (7×6×5×4×3×2×1)
= 42×5×4×3×2×1
= 210×4×3×2×1
= 840×3×2×1
= 2.520×2×1
= 5.040×1
= 5.040
5! = (5×4×3×2×1)
= 20×3×2×1
= 60×2×1
= 120×1
= 120
5040
120 +
5.160
12²×5-13² = 551
12² = 12×12 = 144 12
12 ×
24
12 +
144
13² = 13×13 = 169 13
13 ×
39
13 +
169
12²×5-13² 144
144×5-169 5 ×
720-169. 720
551. 169 -
551
