The problem of mathematical simple calculation 1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256
=128/256+64/256+32/256+16/256+8/256+4/256+2/256+1/256
=255/256
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- 1. What can be calculated simply must be calculated simply, and what cannot be calculated simply can not be calculated simply 1.5/7÷5/12×(7/12-5/12)+5/7 2.3 / 16 × 1 and 7 / 9 + 1 / 2 × 7 / 13 + 6 / 13 × 0.5 3.(4/5-1/3)÷(7/8+7/10×5/12) 4.4/9÷〖4/5-(1/5+1/3)〗 5.2 and 2 / 3 × 4 / 5 + 0.8 × 1 and 1 / 3 + 6 × 80 ‰ 6.15/16+(7/16-1/4)÷1/2 7.1/3÷(2/3-2/5)×3/5 8.8/9+8/9+8/9+8/9+5/9 9.〖1/2-(3/4-3/5)〗÷7/10 10.(3/5-2/5×3/4)÷1/5+0.5 100 points for satisfaction Make it clear
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- 20. Xiao Zhang is walking at a constant speed on the ring road. Every four minutes, a bus meets him head-on. Every 12 minutes, a bus of the same route runs from his back to his front. How many minutes does the bus stop send a bus?