<span>-x^2-4x=0
</span><span>x^2+4x=0
</span>x(x+4)=0
x=0
x= - 4
-х+4(7-х)=-7х+5
-х+28-4х=-7х+5
-х-4х+7х=5-28
2х=-23
х=-23/2
х=-11,5
56=7*8 42=6*7
8*7*m^5n^7/6*7*m^5n^10=4/3m^5n^3
-6а+7b+3а-4b<span>,если а=3,2,b=4,2
-6*3,2+7*4,2+3*3,2-4*4,2=-19,2+29,4+9,6+16,8=36+39=75</span>
(3/4 + 2 3/4) * 25,8 = 90,3
1) 3/4 + 2 3/4 = 2 6/4 = 3 2/4 = 3 1/2 = 3,5
2) 3,5 * 25,8 = 90,3
3/4 = 0,75 2 3/4 = 2,75 в десятичных дробях
(0,75 + 2,75) * 25,8 = 3,5 * 25,8 = 90,3