128×126／127怎么简便运算?
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128×126／127怎么简便运算?128×126／127怎么简便运算?128×126／127怎么简便运算?=(127+1)*(127-1)/127=(127^2-1^2)/127=127^2/127
128×126／127怎么简便运算?
128×126／127怎么简便运算?
128×126／127怎么简便运算?
=(127+1)*(127-1)/127
=(127^2-1^2)/127
=127^2/127-1^2/127
=127-1/127
=126又127分之126
128×126／127
=(127+1)×(127-1)/127
=(127²-1²)/127
=127-1/127
=126又127分之126
128×126／127
=(127+1)(127-1)/127
=（127²-1²)/127
=127-1/127
=126又127分之126