2.3×0.48+0.48×8.7-0.12×4(巧算)

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2.3×0.48+0.48×8.7-0.12×4(巧算)2.3×0.48+0.48×8.7-0.12×4(巧算)2.3×0.48+0.48×8.7-0.12×4(巧算)2.3×0.48+0.48×8.

2.3×0.48+0.48×8.7-0.12×4(巧算)
2.3×0.48+0.48×8.7-0.12×4(巧算)

2.3×0.48+0.48×8.7-0.12×4(巧算)
2.3×0.48+0.48×8.7-0.12×4
=2.3×0.48+0.48×8.7-0.48
=2.3*0.48+0.48+8.7-0.48*1
=0.48*(2.3+8.7-1)
=0.48*10
=4.8

=2.3*0.48+0.48×8.7-0.48*2
=0.48*(2.3+8.7-1)
=0.48*10
=4.8

原式=0.48(2.3+8.7-1)=0.48*10=4.8