用简便方法计算下列各题： 9.8x2.5= 1.25x64= 10.1x8.5=

9.8x2.5
=(10-0.2)x2.5
=10x2.5-0.2x2.5
=25-0.5
=24.5

1.25x64
=1.25x8x8
=10x8
=80

10.1x8.5
=(10+0.1)x8.5
=10x8.5+0.1x8.5
=85+0.85
=85.85
祝学习进步，望采纳~

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