0.9999x1.3-0.1111x2.7 64x1.25x0.25x0.5 17.48x37-174.8x1.9+1.748x820 怎样用简便算法
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0.9999x1.3-0.1111x2.7=0.9999x1.3-0.9999x0.3=0.9999*1=0.9999
64x1.25x0.25x0.5 =8*4*2*1.25x0.25x0.5 =8*1.25*4*0.25*2*0.5=1(*号代表乘法)
17.48x37-174.8x1.9+1.748x820
=17.48*37-17.48*19+17.48*82
=17.48*(82+37-19)
=17.48*100=1748
64x1.25x0.25x0.5 =8*4*2*1.25x0.25x0.5 =8*1.25*4*0.25*2*0.5=1(*号代表乘法)
17.48x37-174.8x1.9+1.748x820
=17.48*37-17.48*19+17.48*82
=17.48*(82+37-19)
=17.48*100=1748
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