123+124+125+126+127的简便运算?
1个回答
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123+124+125+126+127
=123+2+124+1+125+126-1+127-2
=125+125+125+125+125
=625,6,125*5=625,2,(124+126)+(123+127)+125,2,把他们都看成100,于是就有了5个100,所以用5*100.还剩下23.24.25.26.27再用简便算法(23+27)+(24+26)+25.
完整算式是
=100*5+(23+27)+(24+26)+25.,2,123+124+125+126+127
=(123+127)+(124+126)+125
=250+250+125
=625,2,123+127=250
124+126=250
125+250+250=625,2,125*5=625,1,(123+127)+(124+126)+125,0,3+4+5+6+7+20*5+100*5,0,
=123+2+124+1+125+126-1+127-2
=125+125+125+125+125
=625,6,125*5=625,2,(124+126)+(123+127)+125,2,把他们都看成100,于是就有了5个100,所以用5*100.还剩下23.24.25.26.27再用简便算法(23+27)+(24+26)+25.
完整算式是
=100*5+(23+27)+(24+26)+25.,2,123+124+125+126+127
=(123+127)+(124+126)+125
=250+250+125
=625,2,123+127=250
124+126=250
125+250+250=625,2,125*5=625,1,(123+127)+(124+126)+125,0,3+4+5+6+7+20*5+100*5,0,
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