3/2a<3b<4c
3/2*5/4a<5c<6d
3/2*5/4*7/6a<7d<1990
35/16 *a<1990
a<909.7
a=909為好
已知正整數(shù)a.b.c.d滿足a
已知正整數(shù)a.b.c.d滿足a
數(shù)學(xué)人氣：433 ℃時間：2020-09-08 14:56:23
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