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405 72 37 = 4 + 5 + 7 + 2 + 3 + 7 = 28 = 10 = 1
8 916 489 44 53 = 8 + 9 + 1 + 6 + 4 + 8 + 9 + 4 + 4 + 5 + 3 = 61=6+1 = 7
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1. 11
, 11?
, 63 11. , 11 :
6_3
:
6_(6+3)_3
:
63*11=693
, , :
79*11=
7_(7+9)_9
(7+1)_6_9
79*11=869
2. , 5
, 5, 25, :
45*45=4*(4+1)_25=2025
3. 5
, 5?
2. , 0 , , 5 :
1248*5=(1248/2)_(0 5)=624_(0 5)=6240 ( 2 )
4469*5=(4469/2)_(0 5)=(2234.5)_(0 5)=22345 ( 2 )
4. 4
, , 4, . 4, 2, 2:
67*4=67*2*2=134*2=268
5. 15%
15% - , , . 10% ( 10) 10%.
15% 884 =(10% 884 )+((10% 884 )/2)=88.4 + 44.2 = 132.6
6.
, , , :
32*125
16*250
8*500
4*1000=4000
7. 5
5 . , 2 :
175/5
2: 175*2=350
: 35.0 35
1244/5
2: 1244*2=2488
: 248.8
8. 1000
, , 9, , 10:
1000-489=(9-4)_(9-8)_(10-9)=511
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