25 1 / 3 - [(22-19.75) - 17.25-16 1 / 3] simple calculation

25 1 / 3 - [(22-19.75) - 17.25-16 1 / 3] simple calculation

25 and 1 / 3 - [(22-19.75) - 17.25-16 and 1 / 3]
=76/3-[2.25-17.25-49/3]
=76/3-2.25+17.25+49/3
=125/3+15
=46 and 2 / 3

Calculation: 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19

Method 1: 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19, = (11 + 19) + (12 + 18) + (13 + 17) + (14 + 16) + 15, = 30 × 4 + 15, = 135; method 2: 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19, = 15 × 9, = 135

223²-224×222
Give 100 points to the process

Original form
=223²-(223+1)*(223-1)
=223²-(223²-1)
=1