有一根铁丝长a cm,第一次用去它的一半少1 cm,第二次用去剩下的一半还多1cm.还剩多少厘米?
有一根铁丝长a cm,第一次用去它的一半少1 cm,第二次用去剩下的一半还多1cm.还剩多少厘米?
数学人气:619 ℃时间:2019-08-20 16:43:03
优质解答
原长:a cm第1次 用去 :(0.5a-1)cm第2次 用去:[0.5×(a-0.5a+1)+1]cm∴还剩:a-(0.5a-1)-[0.5×(a-0.5a+1)+1]=a-0.5a+1-[0.5×0.5a+0.5+1]=a-0.5a+1-0.25a-1.5=0.25a-0.5(cm)...
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