3.06×2.94 = (3+0.06)(3-0.06)
6.5²×3.14-3.5²×3.14
=(6.5²-3.5²)3.14
=(6.5+3.5)(6.5-3.5)3.14
２：x²+y²-2xy
=x²-2xy+y²
=(x-y)²
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