8.5*2.5+7.18简便法怎么算呀
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8.5*2.5+7.18简便法怎么算呀
8.5*2.5+7.18简便法怎么算呀
8.5*2.5+7.18简便法怎么算呀
8.5*2.5+7.18
=8*2.5+0.5*2.5+7.18
=20+7.305
=27.305
8.5*2.5+7.18简便法怎么算呀
8.5*2.5+7.18简便法怎么算呀
8.5*2.5+7.18简便法怎么算呀
8.5*2.5+7.18
=8*2.5+0.5*2.5+7.18
=20+7.305
=27.305