(√12-√20)(√15+5)-(√10-√2)²
=(2√3-2√5)[√(3×5)+√√5²]-2(√5-1)²
=2(√3-√5)*√5(√3+√5)-2(6-2√5)
=2√5(3-5)-12+4√5
=-4√5+4√5-12
=-12
(根号下12-根20)(根15+5)-(根10-根2)方 =
(根号下12-根20)(根15+5)-(根10-根2)方 =
数学人气:543 ℃时间:2019-12-10 05:08:57
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