用简便方法计算:10.37×3.4+1.7×19.26=_______________________。1.25×32×0.25=________________。
3.84×101-3.84=____________________。3.51×49+35.1×5.1+49×51=___________________________...
3.84×101-3.84=____________________。3.51×49+35.1×5.1+49×51=___________________________。1994×19951995-1995×19941994=_________________________。
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2013-09-05 · 知道合伙人教育行家
wangcai3882
知道合伙人教育行家
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10.37×3.4+1.7×19.26
=10.37×3.4+1.7×2x9.63
=10.37×3.4+9.63×3.4
=(10.37+9.63)×3.4
=20×3.4
=68
1.25×32×0.25
=(1.25×8)x(4×0.25)
=10x1
=10
3.84×101-3.84
=3.84×101-3.84x1
=3.84×(101-1)
=3.84×100
=384
3.51×49+35.1×5.1+49×51
=3.51x49+3.51x51+49x51
=3.51x100+49x51
=351+49x51
=351+(50-1)x(50+1)
=351+2500-1)
=350+1+2500-1
=2850
1994×19951995-1995×19941994
=1994×(19950000+1995)-1995×(19940000+1994)
=1994×1995×10000+1994×1995-1995×1994×10000-1995×1994
=0
=10.37×3.4+1.7×2x9.63
=10.37×3.4+9.63×3.4
=(10.37+9.63)×3.4
=20×3.4
=68
1.25×32×0.25
=(1.25×8)x(4×0.25)
=10x1
=10
3.84×101-3.84
=3.84×101-3.84x1
=3.84×(101-1)
=3.84×100
=384
3.51×49+35.1×5.1+49×51
=3.51x49+3.51x51+49x51
=3.51x100+49x51
=351+49x51
=351+(50-1)x(50+1)
=351+2500-1)
=350+1+2500-1
=2850
1994×19951995-1995×19941994
=1994×(19950000+1995)-1995×(19940000+1994)
=1994×1995×10000+1994×1995-1995×1994×10000-1995×1994
=0
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