Question

Tìm x:

a) 3 (2x-1)- 5(x-3)+ 6(3x-4)=24

b) 2x^2 +3(x^2-1) = 5x(x+1)

c) 2x( 5-3x) + 2x(3x-5) -3(-7)=3

d) 3x (x+1) -2x(x+2)=-1-x

 

Answer 1

a,6x-3-5x+15+18x-24=24

19x-12=24

19x=36

x=36/19

c,10x-6x²+6x²-10x+21=3

0x=-18

không có x

d,3x²+3x-2x²-4x=-1-x

x²-x=-1-x

x²-x+x=-1

x²=-1

không có x thỏa mãn

Answer 2

b,2x²+3x²-3=5x²+5x

5x²-5x²-5x=3

-5x=3

x=\(\frac{-3}{5}\)