Bantu Tugas Matematika

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1) 12 frac{1}{2} + frac{2}{5} - 2.4 div 50 % : = ....
2)Panjang busur lingkaran dengan sudut pusat 75° dan jari-jari 21 cm adalah…..cm.

Nt:No 1 itu 2,4 ya bukan 2.4

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Bantu Tugas Matematika

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Gambar Jawaban

Jawaban:

~Pecahan dan bangun datar

1. 12 1/2 + 2/5 – 2,4 ÷ 50%

= 25/2 + 2/5 – 24/10 ÷ 50/100

= 125/10 + 4/10 – 24/10 ÷ 5/10

= 125/10 + 4/10 – 24/10 × 10/5

= 125/10 + 4/10 – 240/50

= 125/10 + 4/10 – 24/5

= 125/10 + 4/10 – 48/10

= 129/10 – 48/10

= 81/10

= 8 1/10

2. Panjang busur = 75°/360° × π × 2 × r

= 75°/360° × 22/7 × 2 × 21

= 75°/360° × 22/7 × 42

= 75°/360° × 22 × 6

= 75°/360° × 132

= 27,5 cm