倒推法问题|五年级奥数问题及答案
倒推法:
马小虎在做一道整数减法题时,把减数个位上的1看成7,把十位上的7看成1,得出差为111,则正确答案是?
倒推法答案:
30×30×30=27000,40×40×40=64000,则这三个数在30和40之间,
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