Tolong bantuin caranya. no 4, 5, 6

4.) akar 18 + akar 32 - akar 50
= (akar 9×2) + (akar 16×2) -(akar 25×2)
= (3 akar 2) + (4 akar 2) - (5 akar 2)
= 2 akar 2 (D)
5.) 6 / (akar 7)+2
= 6 × [(akar 7) - 2] / [(akar 7)+2] × [(akar 7) - 2]
= 6 akar 7 - 12 / 7-4
= 6 akar 7 - 12 / 3
= 2 akar 7 - 4
= 2 (akar 7 - 2) (B)
6.) 40% × 1250000
= 500.000
Harga jual = harga beli + laba
= 1.250.000 + 500.000
= 1.750.000
Maaf kalau salah