Current location - Training Enrollment Network - Mathematics courses - The practical problems of mathematics in the last semester of grade three and the questions of quadratic equation in one yuan;
The practical problems of mathematics in the last semester of grade three and the questions of quadratic equation in one yuan;
1) x+y = 14, xy = 45x = 5, y = 9 or x=9, y=5 x-y= plus or minus 4.
2)20+20 *( 1+x)+20 *( 1+x)*( 1+x)= 95
3) 20+x*0.8=x- 12
1) a 400+400 * (1+x)+400 * (1+x) * (1+x) =1324.
2) A Let the GDP in 2005 be X, then X * (1+0.118) =1493.