Quiz spesial ulang tahun yang ke – 15

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□ Penyelesaian

= 7x + 8a – 8b + 8a + 9b – 3x

= ( 7 – 3 )x – 8a – 8b + 8a + 9b

= 4x + 8a – 8b + 8a + 9b

= 4x + ( 8 + 8 )a – 8b + 9b

= 4x + 16a – 8b + 9b

= 4x + 16a – ( 9 – 8 )b

= 4x + 16a – 1b

= 4x + 16a – b

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= 90 + 8 + 3!

= 90 + 8 + ( 3 × 2 × 1 )

= 90 + 8 + ( 6 × 1 )

= 90 + 8 + 6

= 98 + 6

= 104

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= 80 + 9 + 6 × 2

= 80 + 9 + 12

= 89 + 12

= ( 80 + 10 ) + ( 9 + 2 )

= 90 + 11

= 101

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7x + 8a – 8b + 8a + 9b – 3x

= (7x – 3x) (8a + 8a) ( – 8b + 9b)

=> 4x + 16a + b

90 + 8 + 3!

= 90 + 8 + (3.2.1)

= 98 + 6

=> 104

80 + 9 + 6 × 2

= 89 + 12

=> 101