202+349,402+199用简便方法计算
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202+349,402+199用简便方法计算
202+349,402+199用简便方法计算
202+349,402+199用简便方法计算
202+349=200+2+350-1=550+2-1=551
402+199=400+2+200-1=600+2-1=601