四年级下册简便计算①28X11111+9999X8 - 知识问答

四年级下册简便计算①28X11111+9999X8②73X33+66X9

3个回答

①28X11111+9999X8
=28X11111+1111X9X8
=(28+9X8)X1111
=100X1111
=111100
②73X33+66X9
=73X33+33X2X9
=(73+18)X33
=91X33
=90X33+1X33
=2970+33
=3003

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