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0.25乘以6.16平方-4乘1.04平方 用简便方法计算
人气:294 ℃ 时间:2019-08-21 02:14:17
解答
0.25乘以6.16平方-4乘1.04平方
=0.5²x6.16²-2²x1.04²
=3.08²-2.08²
=(3.08+2.08)(3.08-2.08)
=5.16x1
=5.16
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