... we getxn+ j = f × g1 + g2 + hg1 + f × g2 + hxn+ j−1, ,xn+ j−r≥minfxn+ j−1, ,xn+ j−r,1fxn+ j−1, ,xn+ j−r≥minmin1≤i≤rxn+ j−i,1/xn+ j−i,1max1≤i≤rxn+ ... g2 + hg1 + f × g2 + hxn+ j−1, ,xn+ j−r≤maxfxn+ j−1, ,xn+ j−r,1fxn+ j−1, ,xn+ j−r≤maxmax1≤i≤rxn+ j−i,1/xn+ j−i},1min1≤i≤rxn+ j−i,1/xn+ ... Equationsxn = xn−1 + xn−2xn−3 + axn−1xn−2 + xn−3 + a, n = 1,2, , x−2,x−1,x0> 0 (see [14]),(1.5)xn = xn−1xn−2 + xn−3 + axn−2 + xn−1xn−3 + a, n = 1,2, , x−2,x−1,x0>...