e)$x^{2}$ +3 = 39
=>$x^{2}$ =39 - 3
=>$x^{2}$ =36
=>Th1: x= 6
=> Th2 : x= -6
f)1+2+3+4+...+x=55
=> 1+2+3+...+x = 1+2+3+...+10
=> x = 10
g)x+2x+3x+...+10 x = 110
=> (1+2+3+...+10)×X=110
=>55×X=110
=>X=110÷55
=>X=2
h)$2^{X}$ × $2^{2×X}$ ×.....×$2^{10×x}$ =$4^{55}$
=>$2^{X}$ × $2^{2×X}$ ×.....×$2^{10×x}$=$2^{110}$
=>$2^{X+2X+3X+...+10X}$ =$2^{100}$
=>$2^{(1+2+3+4+...+10)X}$ =$2^{110}$
=>$2^{55×X}$ =$2^{110}$
=>55×X=110
=> X=110÷55
=>X=2
