a-(2ab-b²)/a为什么等于(a²-2ab+b²)/a 谢谢.
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a-(2ab-b²)/a为什么等于(a²-2ab+b²)/a 谢谢.
a-(2ab-b²)/a为什么等于(a²-2ab+b²)/a 谢谢.
a-(2ab-b²)/a为什么等于(a²-2ab+b²)/a 谢谢.
a-(2ab-b²)/a
=a²/a-(2ab-b²)/a
=(a²-2ab+b²)/a