600дм2=6м2 простые законы математики
32x46-26x32 = 32x(46-26) = 32 x 20 = 640
44x18 +12x44 = 44x(18+12) = 44 x 30 = 1320
75x85-85x73 = 85 x (75-73) = 85 x 2 = 170
19x42-17x42 = 42 x (19-17) = 42 x 2 = 84
26x58-58x16 = 58 x (26-16) = 58 x 10 = 580
121x21+79x121 = 121 x (21+79) = 121 x 100 = 12100
Вот ответ 1000 милиметров