Toán Lớp 8: Tìm x
( 3x – 5).( 7 – 5x) – ( 5x + 2) ( 2 – 3x) = 4
Mong các bạn giúp đỡ nhaaa
Leave a reply
Register Now
Login
Lost Password
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Toán Lớp 8: Tìm x
( 3x – 5).( 7 – 5x) – ( 5x + 2) ( 2 – 3x) = 4
Mong các bạn giúp đỡ nhaaa
Comments ( 2 )
⇔-15x²+46x-35- (-15x²+4x+4)-4=0
⇔42x-43=0
⇔x=43/42
Vậy x =43/42
<=> ( 21x -15x^2 -35 +25x) – (10x -15x^2 + 4-6x)=4
<=> 21x -15x^2 -35 +25x- 10x + 15x^2 – 4+6x =4
<=> 42x – 39 =4
<=> 42x = 43
<=< x =43/42