i) \(2345-1000:\left[19-2\cdot\left(21-18\right)^2\right]\\ =2345-1000:\left[19-2\cdot3^2\right]\\ =2345-1000\\ =1345\)
j) \(107-\left\{38+\left[7\cdot3^2-24:6+\left(9-7\right)^3\right]\right\}\\ =107-\left[38+\left(7\cdot9-4+8\right)\right]\\ =107-105\\ =2\)
k)\(307-\left[\left(180-160\right):2^2+9\right]:2\\ =307-\left(20:4+9\right):2\\ =307-14:2\\ =307-7\\=300 \)
o) \(125\cdot\left(28+72\right)-25\cdot\left(3^2\cdot4+64\right)\\ =125\cdot100-25\cdot100\\ =100\cdot100\\ =10000\)
p) \(500-\left\{5\cdot\left[409-\left(2^3\cdot3-21\right)^2\right]+10^3\right\}\\ =500-\left[5\cdot\left(409-9\right)+1000\right]\\ =500-\left(2000+1000\right)\\ =-2500\)
l) \(205-\left[1200-\left(4^2-2\cdot3\right)^3\right]:40\\ =205-\left[1200-10^3\right]:40\\ =205-200:40\\ =205-5\\ =200\)
m) \(177:\left[2\cdot\left(4^2-9\right)+3^2\cdot\left(15-10\right)\right]\\ =177:\left(2\cdot7+9\cdot5\right)\\ =177:59\\ =3\)
n) \(\left[\left(25-2^2\cdot3\right)+\left(3^2\cdot4+16\right)\right]:5\\ =\left(13+52\right):5\\ =65:5\\ =13\)
