9x² - 6 - 3x + 2 = 0
9x² - 3x - 4 = 0
D = b² - 4ac = 9 + 144 = 153
x1 = ( 3 + √153) / 18
x2 = ( 3 - √153) /18
x + 25x² + 20x + 4 = 75 + 25x²
21x + 25x² - 25x² = 71
21x = 71
x = 71/21
x = 3целых 8/21
4x² - 12x + 9 - 8x - 4x² = 13
- 20x = 13 - 9
- 20x = 4
20x= - 4
x = - 0,2
20x + 16x² - 25 - 20x - 16x² + 2x = 0
2x = 25
x = 12,5
8,4х+3-(36х+1,5)=8,4х+3-36х-1,5=1,5-27,6х.
При х =1 целая 2/3, 1,5-27,6х =1,5-27,6×1целую 2/3= 1,5-138/5×5/3=1,5-690/15=1,5-46=-44,5
7m-11n=7*(-6/11)-11*6/3=-(42/11)-22=(-42-242)/11=-284/11=-25.81