a, 2x –(3 -5x) = 4(x+3)
b, 2x+3 = 5x + 9
c, x(x+2) = x(x+3)
d, 2(x-3)+5x(x-1) =5x^2
giúp vs ah mk đg can gấp nhá!!!
camon!!!
a, 2x –(3 -5x) = 4(x+3)
b, 2x+3 = 5x + 9
c, x(x+2) = x(x+3)
d, 2(x-3)+5x(x-1) =5x^2
giúp vs ah mk đg can gấp nhá!!!
camon!!!
Chúc bn hok tốt!
Cho mk câu trả lời hay nhất nhé!
Đáp án:
a)2x-(3-5x)=4(x+3)
2x-3+5x=4x+12
2x+5x-4x=12+3
3x =15
x =5
b)2x+3=5x+9
2x-5x=9-3
-3x=6
x=-2
c)x(x+2)=x(x+3)
x^2+2x=x^2+3x
x^2-x^2+2x-3x=0
-x=0(x vô nghiệm)
d)2(x-3)+5x(x-1)=5x^2
2x-6+5x^2-5x =5x^2
5x^2-5x^2+2x-5x=6
-3x=6
x=-2