Х + у = 45
х - у = 13
2х = 58 | : 2
x = 29
29 - y = 13
y = 29 - 13
y = 16
( 29; 16 )
560*0,08=44,8
560-44,8=516,2
560+516,2=1076,2
504 = 2 * 2 * 2 * 3 * 3 * 7 = 2³ * 3² * 7
1) -8+3*4*k-6*k^2+k^3<span>2)-0.125+0.75*p^2 -0.15*p^2+p^3</span>
<span>-6·(9-5x)=9x+9</span>,
-54 + 30х =9х+9,
30х - 9х = 9 + 54,
21х = 63
х=63:21
х=3