用简便方法计算:27.5²-55×12.5+12.5²
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用简便方法计算:27.5²-55×12.5+12.5²
用简便方法计算:27.5²-55×12.5+12.5²
用简便方法计算:27.5²-55×12.5+12.5²
:27.5²-55×12.5+12.5²
=27.5²-2×27.5×12.5+12.5²
=(27.5-12.5)²
=15²
=225