下面是李叔叔2010年5月份信用卡的对账单（单位：元）．李叔叔的信用卡4月份的结余金额是多少元？
1+3= ．
= ．
口算 55+37= 80﹣26= 1400﹣800= 2+210= 9+300= 82+0= 1﹣= += ﹣= ．
口算我最棒.+=+=﹣=﹣=+= 1+=﹣0.2=+0.3=+= 1﹣+=﹣﹣=++=
==== 0.32===== 2x+x=
+3= ．
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﹣0.2=
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= 2x+x=
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