Help me judge if this is the simplest quadratic radical Tick (A & # 178; + B & # 178;) (the square of a under the root plus the square of B) urgent!

Yes, it's the simplest root. You can't remove the root or simplify other factors

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1. Basic properties of fraction: the numerator and denominator of fraction are multiplied by (or divided by) the same integral which is not equal to zero, and the value of fraction remains unchanged, which is expressed as
2. In the formula, what conditions should the numerator and denominator satisfy to make their values zero
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