用简便方法计算55²x5-45²x5

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用简便方法计算55²x5-45²x5用简便方法计算55²x5-45²x5用简便方法计算55²x5-45²x555^2x5-45^2x5=5x

用简便方法计算55²x5-45²x5
用简便方法计算55²x5-45²x5

用简便方法计算55²x5-45²x5
55^2x5-45^2x5
=5x(55^2-45^2)
=5x(55+45)x(55-45)
=5x100x10
=5000