tolong di bantu jawab dan dikasih caranya soal no 4&5

56-15:3x7
56-5x7
56-35
= 21
maaf kalo salah

No. 4
56 - 15 : 3 × 7
= 56 (-15 : 3) × 7
= 56 (-5 × 7)
= 56 - 35
= 21
Jawaban no 4 adalah C. 21

No. 5
[tex] \frac{6}{( \sqrt{5 - \sqrt{2} } \: ) } \\ = \frac{6( \sqrt{5 + \sqrt{2} } \: ) }{(5 - 2)} \\ = \frac{6 \sqrt{5 + \sqrt{2} } }{3} \\ = 2 \: ( \sqrt{5 + \sqrt{2} } \: ) \\ = 2 \sqrt{5} \: + 2 \sqrt{2} [/tex]
Jawaban No.5 = A. 2√5 + 2√2