用简便方法计算:6.58-(1.58+1.98)

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用简便方法计算:6.58-(1.58+1.98)用简便方法计算:6.58-(1.58+1.98)用简便方法计算:6.58-(1.58+1.98)6.58-(1.58+1.98)=6.58-1.58-1

用简便方法计算:6.58-(1.58+1.98)
用简便方法计算:6.58-(1.58+1.98)

用简便方法计算:6.58-(1.58+1.98)
6.58-(1.58+1.98)
=6.58-1.58-1.98
=5-(2-0.02)
=5-2+0.02
=3.02