√18-(√80+√32-√20)等于多少
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![√18-(√80+√32-√20)等于多少](/uploads/image/z/668106-18-6.jpg?t=%E2%88%9A18-%28%E2%88%9A80%2B%E2%88%9A32-%E2%88%9A20%29%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91)
√18-(√80+√32-√20)等于多少
√18-(√80+√32-√20)等于多少
√18-(√80+√32-√20)等于多少
原式
=√18-√80-√32+√20
=3√2-4√5-4√2+2√5
=(3√2-4√2)-(4√5-2√5)
=-√2-2√5
√18-(√80+√32-√20)
=3√2-(4√5+4√2-2√5)
=-2√5-√2
=3√2-(4√5+4√2-2√5)
=-√2-2√5