100!/98! 等于多少 100+98等于多少
100!/98!\u7b49\u4e8e\u591a\u5c119900
198
100! = 100*99*98*97*……*3*2*198! = 98*97*96*……*3*2*1
然后约分
得:100×99=9900
100*99*98......因为都含有公因数并且是除法,所以把公因子98*97*96等约分,98!被约掉,100!也剩下100*99了,在相乘。
100!=100*99*98*97*.......*3*2*1
98!=98*97*.......*3*2*1
故100!/98!=100*99=9900
100! = 100*99*98*97*……*3*2*1
98! = 98*97*96*……*3*2*1
100!/98!=100*99=9900
100!/98!=100×99×98!/98!=100×99=9900
绛旓細瑙o細100锛梅99锛=锛100脳99脳98脳...脳2脳1锛壝凤紙99脳98脳97脳...脳2脳1锛=100
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