Question

DAU 35 DE PUNCTE!!! exercitiul 16

Answer 1

a) 3/7= x/28 ⇒ 7x = 28*3⇒ x= 28*3:7 = 12
b) 45/x=3/7⇒ 3x=45*7⇒ x= 45*7:3 = 105
c) 2x+1/21 = 3/7 ⇒ 2x+1 = 21*3:7=9⇒ 2x=9-1⇒ 2x=8⇒ x=4
d) 51/38+x² = 3/7 ⇒ 38+x² = 51*7:3=119 ⇒ x²=119-28=81 ⇒ x=9