42x(8/1+24/1+48/1+80/1+120/1+168/1)=? Please

157 / 21 answers

(1/8+1/24+1/48+1/80+1/120+1/168+1/224+1/288)*128

（1/8+1/24+1/48+1/80+1/120+1/168+1/224+1/288)×128=128×(1/8)[1+1/3+1/6+1/10+1/15+1/21+1/28+1/36] =128×(1/8)[1+2(1/(2×3)+1/(3×4)+1/(4×5)+1/(5×6)+1/(6×7)+1/(7×8)+1/(8×9)] =128×(1/8)[1+2(1/2-1/...

（8/1+24/1+48/1+80/1+120/1+168/1+224/1+288/1）*128

How long is the shadow at 8:10 a.m., 12 noon, 2:4 p.m. and 6 p.m

It's hard to say. It's related to your latitude, season and time standard
The higher the latitude, the longer the shadow
The shadow is short in summer and long in winter
If it happens to be in the middle longitude of a certain time zone and the standard time zone is used, from 8 a.m. to 6 p.m., the shadow grows first and then gradually becomes shorter, the shortest is at 12 p.m., and then becomes longer, and the longest is at 6 p.m. (if the sun doesn't set at 6 p.m., the shadow will be longer, but you only talk about 6 p.m.)
If you are in a time zone and use the standard time of that time zone, but you are not in the middle longitude of that time zone, then the shortest shadow time is not 12 noon

42x(8/1+24/1+48/1+80/1+120/1+168/1)=? Please