70x – 20x + 25x : 5x + x! = …x –> 5​

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70x – 20x + 25x : 5x + x! = …x –> 5​

PENYELESAIAN

70x – 20x + 25x : 5x + x!

70(5) – 20(5) + 25(5) : 5(5) + 5!

350 – 100 + 125 : 25 + (5 × 4 × 3 × 2 × 1)

350 – 100 + 125 : 25 + (24 × 6)

350 – 100 + 125 : 25 + 120

350 – 100 + 5 + 120

250 + 5 + 120

255 + 120

375

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70x – 20x + 25x ÷ + x!

x = 5

= 70(5) – 20(5) + 25(5) ÷ 5(5) + 5!

=(70 × 5) – (20 × 5) + (25 × 5) ÷ (5 × 5) + (5 × 4 × 3 × 2 × 1)

= 350 – 100 + 125 ÷ 25 + ( 20 × 3 × 2 × 1 )

= 350 – 100 + 125 ÷ 25 + ( 60 × 2 × 1 )

= 350 – 100 + 125 ÷ 25 + ( 120 × 1 )

= 350 – 100 + 125 ÷ 25 + 120

= 250 + ( 125 ÷ 25 ) + 120

= 250 + 5 + 120

= 255 + 120

= 375

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