1)205 = 200 + 5 = 2 + 0 + 5 = 7205 000 = 200 000 + 5 000 = 2 + 0 + 0 + 0 + 0 + 5 + 0 + 0 + 0 = 7205 040 = 200 000 + 5 000 + 40 = 2 + 0 + 0 + 0 + 0 + 5 + 0 + 4 + 0 = 111 648 = 1 000 + 600 + 40 + 8 = 1 + 0 + 0 + 0 + 6 + 0 + 4 + 8 = 19640 008 = 600 000 + 40 000 + 8 = 6 + 0 + 0 + 0 + 0 + 0 + 4 + 0 + 0 + 0 + 8 = 18164 800 = 100 000 + 60 000 + 4 000 + 800 = 1 + 0 + 0 + 0 + 0 + 6 + 0 + 0 + 7 + 8 + 0 + 0 = 22
2)90 000 + 3 000 + 1 300 = 90 + 0 + 0 + 0 + 3 + 0 + 0 + 1 + 3 + 0 + 0 = 7206 - 300 000 - 6 = 2 + 0 + 6 - 3 + 0 + 0 + 0 - 6 = -1.
1)
205 = 200 + 5 = 2 + 0 + 5 = 7
205 000 = 200 000 + 5 000 = 2 + 0 + 0 + 0 + 0 + 5 + 0 + 0 + 0 = 7
205 040 = 200 000 + 5 000 + 40 = 2 + 0 + 0 + 0 + 0 + 5 + 0 + 4 + 0 = 11
1 648 = 1 000 + 600 + 40 + 8 = 1 + 0 + 0 + 0 + 6 + 0 + 4 + 8 = 19
640 008 = 600 000 + 40 000 + 8 = 6 + 0 + 0 + 0 + 0 + 0 + 4 + 0 + 0 + 0 + 8 = 18
164 800 = 100 000 + 60 000 + 4 000 + 800 = 1 + 0 + 0 + 0 + 0 + 6 + 0 + 0 + 7 + 8 + 0 + 0 = 22
2)
90 000 + 3 000 + 1 300 = 90 + 0 + 0 + 0 + 3 + 0 + 0 + 1 + 3 + 0 + 0 = 7
206 - 300 000 - 6 = 2 + 0 + 6 - 3 + 0 + 0 + 0 - 6 = -1.