987×26-240÷16怎么巧算？

987X26-16X240
=987X10+987X16-16X240
=9870+16X(987-240)
=9870+16X747
=9870+20X747-4X747
=9870+14940-2988
=14940+10000-230-3000+12
=24940-3230+12
=21710+12
=21722

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