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口算.
13+37=
327+89= 648+587=
50-13= 416-89= 1235-648=
50-37= 416-327= 1235-587=
分析:根据整数的加法和减法法则进行计算即可求解.
解答:解:
13+37=50 327+89=416 648+587=1235
50-13=37 416-89=327 1235-648=587
50-37=13 416-327=89 1235-587=648
点评:考查了整数的加法和减法,关键是熟练掌握计算法则,正确进行计算.
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