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y=R/x(a-b)
R=x*y(a-b)
R=x*y*a-x*y*b
x*y*a=R+x*y*b/:x*y
a=(R+x*y*b)/x*y
(x+5)/2-(x-3)<x+1 /*2
x+5-2(x-3)<2x+2
x+5-2x+6<2x+2
-3x<-9/:-3
x>3 x∈(3,+∞)
a=5/6+(-2)²*√1-3/4+2/7=5/6+4*√1/4+2/7=5/6+4*1/2+2/7=5/6+2+2/7=35/42+2+12/42=(2)47/42=(3)5/42
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