用8张卡片组成两个三位数,使它们的和是1000.你能写出几道?
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342+658,432+568,143+857,413+587,124+876,214+786;
348+652,438+562,147+853,417+583,126+874,216+784;
358+642,468+532,157+843,487+513,176+824,286+714;
352+648,462+538,153+847,483+517,174+826,284+716;
答:用8张卡片组成两个三位数,使它们的和是1000,能写出24道.
348+652,438+562,147+853,417+583,126+874,216+784;
358+642,468+532,157+843,487+513,176+824,286+714;
352+648,462+538,153+847,483+517,174+826,284+716;
答:用8张卡片组成两个三位数,使它们的和是1000,能写出24道.
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