(99又4/5)²
= (100-1/5)²
= 100²-2×100×1/5+1/5²
= 10000-40+1/25
= 9060+1/25
= 9060又1/25
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（99又4/5）的平方是多少?要简便运算
(99又4/5)²
= (100-1/5)²
= 100²-2×100×1/5+1/5²
= 10000-40+1/25
= 9060+1/25
= 9060又1/25
--------------------
梳理知识,帮助别人,愉悦自己.
“数理无限”团队欢迎你