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什么数加或乘都等于28
设这两个数为x,y则有：
x y=28
xy=28
x(28-x)=28
-x^2 28x-28=0
x^2-28x 28=0
利用求根公式得到：
x=14 2√42,y=14-2√42
或者：
x=14-2√42,y=14 2√42.
你能用这四个数编两道四则混合以你算题吗
27-26 28=29
29-28 26=27
29-27 26=28
28-26 27=29
一个分数ba（a、b都是自然数），已知5
5＜a＜9，1＜b＜3，且a、b都是自然数，
所以分母可能是6、7、8，分子是2．
所以这个分数可能是、、．
＞＞．
其中最小的分数是．
故答案为：、、；．
请列出用2、5、8、0这四个数字组成的所
共有：3×4×4×4=192种
2000,2002,2005,2008,2020,2022,2025,2028,2050,2052,2055,2058,2080,2082,2085,2088,
2200,2202,2205,2208,2220,2222,2225,2228,2250,2252,2255,2258,2280,2282,2285,2288,
2500,2502,2505,2508,2520,2522,2525,2528,2550,2552,2555,2558,2580,2582,2585,2588,
2800,2802,2805,2808,2820,2822,2825,2828,2850,2852,2855,2858,2880,2882,2885,2888,
5000,5002,5005,5008,5020,5022,5025,5028,5050,5052,5055,5058,5080,5082,5085,5088,
5200,5202,5205,5208,5220,5222,5225,5228,5250,5252,5255,5258,5280,5282,5285,5288,
5500,5502,5505,5508,5520,5522,5525,5528,5550,5552,5555,5558,5580,5582,5585,5588,
5800,5802,5805,5808,5820,5822,5825,5828,5850,5852,5855,5858,5880,5882,5885,5888,
8000,8002,8005,8008,8020,8022,8025,8028,8050,8052,8055,8058,8080,8082,8085,8088,
8200,8202,8205,8208,8220,8222,8225,8228,8250,8252,8255,8258,8280,8282,8285,8288,
8500,8502,8505,8508,8520,8522,8525,8528,8550,8552,8555,8558,8580,8582,8585,8588,
8800,8802,8805,8808,8820,8822,8825,8828,8850,8852,8855,8858,8880,8882,8885,8888,
5656乘以28减2828乘以56简便算
解析：根据题意可以列式如下：
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