100 Great Children's Picturebooks

100 Great Children's Picturebooks

Matematika Tolong dibantu ya ka^^

Tolong dibantu ya ka^^

Jawaban:

25

Penjelasan dengan langkah-langkah:

(2x) + (5x + 5) = 180°

2x+5x + 5 = 180°

7x + 5 = 180°

7x = 180-5

7x = 175

x = 175/7

x = 25

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