几道六年级数学简算题,速速速速~~~~~~~~~~~~~~~~~~~~
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
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