简便计算:78*26+39*48.智力冲浪:985*89-986*889999*2222+3333*3334
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简便计算:78*26+39*48.智力冲浪:985*89-986*889999*2222+3333*3334
简便计算:78*26+39*48.
智力冲浪:985*89-986*88
9999*2222+3333*3334
简便计算:78*26+39*48.智力冲浪:985*89-986*889999*2222+3333*3334
78*26+39*48
=39x2x26+39x48
=39x52+39x48
=39x(52+48)
=39x100
=3900
985*89-986*88
=(986-1)x89-986x88
=986x89-89-986x88
=986x(89-88)-89
=986-89
=897
9999*2222+3333*3334
=3333x3x2222+3333x3334
=3333x6666+3333x3334
=3333x(6666+3334)
=3333x10000
=33330000