问题标题:
【几道六年级数学简算题,速速速速~~~~~~~~~~~~~~~~~~~~1.3.9/(1.3*5)2.3.8*43.7+4.12*38+151*0.383.40*5%/20%+40PS:/=除号*=乘号】
问题描述:
几道六年级数学简算题,速速速速~~~~~~~~~~~~~~~~~~~~
1.3.9/(1.3*5)
2.3.8*43.7+4.12*38+151*0.38
3.40*5%/20%+40
PS:/=除号*=乘号
齐本胜回答:
3.9/(1.3*5)=3.9÷1.3÷5=3÷5=0.63.8*43.7+4.12*38+151*0.38=3.8*43.7+3.8*41.2+3.8*15.1=3.8*(43.7+41.2+15.1)=3.8*100=38040*5%/20%+40=40*1/4+40=40*(1/4+1)=40*(5/4)=50
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