3.9*14.7-3.9*4.7 1.25*3.2*2.5 3.2*101怎样算简便就怎样算_数学解答

3.9*14.7-3.9*4.7 1.25*3.2*2.5 3.2*101怎样算简便就怎样算

人气：246 ℃　时间：2019-09-21 11:01:18

解答

3.9*14.7-3.9*4.7
=3.9X(14.7-4.7)
=3.9X10
=39
1.25*3.2*2.5
=1.25X(8X0.4)X2.5
=(1.25X8)X(0.4X2.5)
=10X1
=10
3.2*101
=3.2X(100+1)
=3.2X100+3.2X1
=320+3.2
=323.2
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