Simple calculation of 0.9 + 1.9 + 29.9 + 399.9 + 4999.9

0.9+1.9+29.9+399.9+4999.9=（0.9＋0.1－0.1）＋（1.9＋0.1－0.1）＋（29.9＋0.1－0.1）＋（399.9＋0.1－0.1）＋（4999.9＋0.1－0.1）=（1-0.1）+（2-0.1）+（30-0.1）+（400-0.1）+（5000-0.1）=1+2+30+400+5000-0....

17.23.37.57. How

23-17=6
37-23=14
57-37=20
14-6=8
20-14=6
c-20=4
c=24
The answer is 57 + 24 = 91

How to calculate 6.17 × 41.9 + 6.71 × 57.1 + 6.71

6.17×41.9+6.71×57.1+6.71=(6.71-0.54)x41.9+6.71×57.1+6.71x1=6.71x41.9-0.54x41.9+6.71×57.1+6.71x1=(41.9+57.1+1)x6.71-0.54x41.9=100x6.71-0.54x41.9=671-22.626=648.374

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