Question

completeaza cu +sau - astfel incat egalitatile sa fie adevarate 20 supra 12 ?14 supra 12?6supra 12=1 repede ms

Answer 1

20/12 - 8/12 = 1 
14/12 - 2/12 = 1 
6/12+ 6/12 = 1 

Answer 2

20/12+/-14/12+/-6/12=1;
20+/-14 +/- 6=12
20-14+6=12
20/12-14/12+6/12=12/12=1