若x+y=5,x-y=3,则2x的2次方-2y的2次方等于
人气:186 ℃ 时间:2019-08-17 17:45:06
解答
2x²-2y²
=2(x²-y²)
=2(x+y)(x-y)
=2×5×3
=30
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