1.10.01乘以7.8怎样巧算 2.28.9乘以4除以289怎样巧算( )乘以（ ）=0.4

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1.10.01乘以7.8怎样巧算 2.28.9乘以4除以289怎样巧算( )乘以（ ）=0.4

1.10.01乘以7.8怎样巧算 2.28.9乘以4除以289怎样巧算( )乘以（ ）=0.4
1.10.01乘以7.8怎样巧算 2.28.9乘以4除以289怎样巧算
( )乘以（ ）=0.4

1.10.01乘以7.8怎样巧算 2.28.9乘以4除以289怎样巧算( )乘以（ ）=0.4
10.01×7.8
＝10×7.8＋0.01×7.8
＝78＋0.078
＝78.078
28.9×4÷289
＝28.9÷289×4
＝0.1×4
＝0.4
﹙4﹚×﹙0.1﹚＝0.4

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