2x – 3 = 0
5 ( 7x + 5 ) + 15 = 0
7 ( 3x + 4 ) – 10 = 4
15 – 2 ( 7x – 3 ) = 11
2x – 3 = 0 5 ( 7x + 5 ) + 15 = 0 7 ( 3x + 4 ) – 10 = 4 15 – 2 ( 7x – 3 ) = 11
By Maria
By Maria
2x – 3 = 0
5 ( 7x + 5 ) + 15 = 0
7 ( 3x + 4 ) – 10 = 4
15 – 2 ( 7x – 3 ) = 11
2x – 3 = 0
⇒ 2x = 3
⇒ x = $\frac{3}{2}$
5 ( 7x + 5 ) + 15 = 0
⇒ 5(7x+5) = -15
⇒ 7x + 5 = -3
⇒ 7x = 2
⇒ x = $\frac{2}{7}$
7 ( 3x + 4 ) – 10 = 4
⇒ 7 ( 3x + 4 ) = 14
⇒ 3x + 4 = 2
⇒ 3x = -2
⇒ x = $\frac{-2}{3}$
15 – 2 ( 7x – 3 ) = 11
⇒ 2 ( 7x – 3 ) = 4
⇒ 7x – 3 = 2
⇒ 7x = 5
⇒ x = $\frac{5}{7}$
Chúc bạn học tốt .-.
@Saphire
Xin hay nhất ạ!
2x – 3 = 0
2x = 3
x = 3 : 2= 3/2
5 ( 7x + 5 ) + 15 = 0
5(7x+5) = -15
7x + 5 = -3
7x = 2
x = 2 : 7= 2/7
7 ( 3x + 4 ) – 10 = 4
7 ( 3x + 4 ) = 14
3x + 4 = 2
3x = -2
x = -2 : 3= -2/3
15 – 2 ( 7x – 3 ) = 11
2 ( 7x – 3 ) = 4
7x – 3 = 2
7x = 5
x = 5 : 7= 5/7