70.1-41.89+2.78怎样简便运算(快点)

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70.1-41.89+2.78怎样简便运算(快点)
70.1-41.89+2.78怎样简便运算(快点)

70.1-41.89+2.78怎样简便运算(快点)
70.1-41.89+2.78
=70.1+2.78-41.89
=72.88-41.89
=72.88-41.88-0.01
=30.99

=70.1-(41.89-2.78)
=70.1-39.11
=30.99

70.1—（41.89—2.78）

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