Ifa-b＝0,whichofthefollowingmustbeequaltoab? A: 2a B: 2b C: a<sup>2</sup> D: a E: o
Ifa-b＝0,whichofthefollowingmustbeequaltoab? A: 2a B: 2b C: a<sup>2</sup> D: a E: o
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Ifa-b＝0,whichofthefollowingmustbeequaltoab? A: 2a B: 2b C: a<sup>2</sup> D: a E: o