7.89-(5.5-2.11)简便运算?
4个回答
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7.89-(5.5-2.11)
=7.89-5.5+2.11 ............去括号
=7.89+2.11-5.5 ..........加法交换律
=10-5.5
=4.5
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展开全部
7.89-(5.5-2.11)
=7.89-5.5+2.11
=2.39+2.11
=4.5
=7.89-5.5+2.11
=2.39+2.11
=4.5
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展开全部
7.89-(5.5-2.11)
=7.89-5.5+2.11
=7.89+2.11-5.5
=10-5.5
=4.5
=7.89-5.5+2.11
=7.89+2.11-5.5
=10-5.5
=4.5
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