1) 441 2) 14400 3) 40000
---------
--------------- 6400 12100 ------- 784
x²+y²=25
x+y=7
х = 7-у
(7-у)² + у² = 25
2у²-14у+ 49 = 25
у²-7у+12 = 0
(х-3)(х-4) = 0
х₁ = 3
х₂ = 4
-15/32+0,7