102*98+28*35
=102*(100-2)+4*7*5*7
=10200-204+4*5*7*7
=10200-204+20*49
=10200-204+980
=10976
102*98+28*35的简便运算
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102*98+28*35
=102*(100-2)+4*7*5*7
=10200-204+4*5*7*7
=10200-204+20*49
=10200-204+980
=10976