42.7-(2.7+2.54)怎样简便运算
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42.7-(2.7+2.54)怎样简便运算42.7-(2.7+2.54)怎样简便运算42.7-(2.7+2.54)怎样简便运算42.7-(2.7+2.54)=42.7-2.7-2.54=40-2.54
42.7-(2.7+2.54)怎样简便运算
42.7-(2.7+2.54)怎样简便运算
42.7-(2.7+2.54)怎样简便运算
42.7-(2.7+2.54)
=42.7-2.7-2.54
=40-2.54
=37.46
撤括号 42.7-2.7-2.54=37.46
没有简便运算