0.75*99+0.7怎么简便急!作业!

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0.75*99+0.7怎么简便急!作业!0.75*99+0.7怎么简便急!作业!0.75*99+0.7怎么简便急!作业!0.75*99+0.7=0.75*(100-1)+0.7=75-0.75+0.7

0.75*99+0.7怎么简便急!作业!
0.75*99+0.7怎么简便急!作业!

0.75*99+0.7怎么简便急!作业!
0.75*99+0.7
=0.75*(100-1)+0.7
=75-0.75+0.7
=74.95

0.75*99+0.7
=0.75*(100-1)+0.7
=75-0.75+0.7
= 74.95

0.75*99+0.7=0.75*99+0.75-0.5=0.75*(99+1)-0.5=75-0.5=74.5

0.75*100-0.75+0.7=74.95

0.75*99+0.7=﹙0.7+0.05﹚×99+0.7=0.7×100+0.05×﹙100-1﹚=70+5-0.05=74.95