You have to put 1,2,3,4,5,6 in every row and column (NO REPEATS!), but also so you get the number in each box using +,-,x or divide. Example: top left it says 11+. The box has two spaces, so you need two numbers that add up to 11. So the only option is 5 and 6. But you don't know which way round yet, so you must look at some other boxes first.

please help me