用简便方法计算。']+I0f.l+^:Z1F
4＋4＋4＋4＋4＋5']+I0f.l+^:Z1F
算式：提示;R5j5},k2g*b6r'd)~)a(U(n']+I0f.l+^:Z1F
=,f:m.E:U2@'L;h8g'J9@0b;t3?(u']+I0f.l+^:Z1F