1) (8 7/12 - 5 19/36) * 1 4/5 = (8 21/36 - 5 19/36) * 1 4/5 = 3 2/36 * 1 4/5 = 3 1/18 * 1 4/5 = 55/18 * 9/5 = 11/2 = 10 1/2 = 10,5. 2) (39,375 - 5 5/8) : 2 5/11 = (39,375 - 5,625) : 2 5/11 = 33,75 : 2 5/11 = 33 3/4 : 2 5/11 = 135/4 : 27/11 = 135/4 * 11/27 = 55/4 = 13 3/4 = 13,75. 3) 10,5 : 13,75 * 100 % = 76 4/11 %.
х в кубе -9=0
х в кубе=9
х = корень 3 степени из 9
1)4x-y=72
-2x+y=11=>y=11+2x
4x-11-2x=72
2x=83
x=41,5
2)2x=11-y
22-2y-y=72
3y=50
y=16 2/3
1) = -10a+1
2)= -0,4т+0,7+2-1т=-1,4т+2,7
3)= 6п-(5п-(4п-3п+2)=6п-(5п+4п+3п-2)=6п-5п-4п-3п+2=-6п+2