计算:(1)(a-3b)(-6a)(2)xn(xn+1-x-1)(3)-5a(a+3)-a(3a-13)(4)-2a2(12ab+b2)-5ab(a
计算:(1)(a-3b)(-6a)(2)xn(xn+1-x-1)(3)-5a(a+3)-a(3a-13)(4)-2a2(12ab+b2)-5ab(a2-1)...
计算:(1)(a-3b)(-6a)(2)xn(xn+1-x-1)(3)-5a(a+3)-a(3a-13)(4)-2a2(12ab+b2)-5ab(a2-1)
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