X²+3x-4x-12-5<x²+16x
x²+3x-4x-x²-16x<12+5
-17x<17
x>17/(-17)
x>-1
А)...=53/12+11/24-4/24=(106+11-4)/24=113/24
б)...=12/15+34/15-18/15=(12+34-18)/15=28/15
а)...=-(11/40*26/33*35/39)=-7/36
б)...=-(28/13*33/34*17/101)=-33/98
S=((a+b)*h)/2
h=√6^2-3^2=√25=5
S=((4+10)*5)/2=35
√2x+4=x-2
2x+4=x²-4
2x+4-x²+4=0
-x²+2x+8=0
x²-2x-8=0
D=-2²-4*1*(-8)=4+32=36
x1=2-6/2=-2
x2=2+6/2=4