(1-1/4) = (2^2 - 1)/2^2 (通分)
= (1×3)/(2×2)
同理:
(1-1/9)= (2×4)/(3×3)
(1-1/16)= (3×5)/(4×4)
.
乘后,很多消掉,11/20
(1-1/4)(1-1/9)(1-1/16),(1-1/100)等于多少
(1-1/4)(1-1/9)(1-1/16),(1-1/100)等于多少
中学难度的题目,要简便的,
中学难度的题目,要简便的,
数学人气:733 ℃时间:2020-01-27 11:46:33
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