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

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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
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

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
3.9/(1.3*5)=3.9÷1.3÷5=3÷5=0.6
3.8*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
=380
40*5%/20%+40
=40*1/4+40
=40*(1/4+1)
=40*(5/4)
=50