0.45*(6又11/25)+3.56/ (2又2/9)
=(9/20)*(161/25)+(89/25)*(9/20)
=(9/20)*(161+89)/25
=(9/20)*10
=9/2
0.45*(6又11/25)+3.56/ (2又2/9)简便计算
0.45*(6又11/25)+3.56/ (2又2/9)简便计算
数学人气:866 ℃时间:2019-12-10 14:27:06
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