A) (2x+4)/(x-7)>0 x≠7 --------------- -2-------------------7-------------------- + - + x∈(-∞;-2)∪(7;∞)
b) x-1/x+5≤0 x≠-5 ------------------- -5----------------------1-------------------- + - + -5<x≤1
(а+5)*5²=(а+5)*25=25а+125
(х-2)*2³=(х-2)*8=8х-16
(a+6)(a-6)=а²-36
(x+3)(x-3x+9)=(x+3)(-2x+9)=-2x²+9х-6x+27=-2x²+3x+27
Q=1/3
1)-972
2)-324
3)-108
4)-36
5)-12
6)-4
сумма:
-972-324-108-36-12-4=-1456
3^(-5-7)/3^-11 = 3^-12/3^-11 = 3^-1 = 1/3.
2.5+3.13*6=2.5+18.78=21.28