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1.2 times 2.5 plus 0.8 times 2.5

1.2 times 2.5 plus 0.8 times 2.5

(1.2+0.8)*2.5
=2*2.5
=5

5 / 9-5 / 12 + 4 / 9

5 / 9-5 / 12 + 4 / 9
=5 / 9 + 4 / 9 - 5 / 12
=1-5 / 12
=7 out of 12

9 () 9 () 9 () 9 () 9 five nines, how to calculate = 17 = 18 = 20

（9×9-9）/9+9=17
（9/9+9/9）×9=18
（9×9+9）/9+9=19
9+9+（9+9）/9=20

Is there a simple method to calculate the two questions 1125-997, 998 + 1246? If so, how to use the simple method?

1125—997
=1125-1000+3
=125+3
=128
998+1246
=1000-2+1246
=2246-2
=2244