А)16х^2+8х=0
8х(2х+1)=0
2х+1=0. 8х=0
2х= 1. х2=0
х1= -1/2
b)36-144х^2=0
144х^2=36
х^2=36/144
х^2= 1/4
х= +- 1/2
c) 5x^2+7x-6=0
D=7^2-4×5÷(-6)=49+120=169
X1= -7+13/2×5=6/10=3/5
X2= -7-13/2×5= -20/10= -2
<span>1). 5x+7≤0
2x+6>0
5x</span>≤-7
2x>-6
x≤ -7/5
x> -6/2
x≤ -1.4
x> -3
-3 -1.4
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x∈(-3; -1,4]
<span>2), 3x+5≥0
2x-4<0
</span>
3x ≥ -5
2x< 4
x≥ -5/3
x< 4/2
x≥ -5/3
x> 2
-5/3 2
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x∈(2; +∞)
А в 3 степени = -1/2 в 3 степени. = -1/8
б = -0.1
-800 × - 1/8 × -0.1 = -10