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)](/uploads/image/z/432669-21-9.jpg?t=70.1-41.89%2B2.78%E6%80%8E%E6%A0%B7%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97%28%E5%BF%AB%E7%82%B9%29)
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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)