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1.Startingat777andcountingbackwardsby7sastudentcounts777,770,763,etc.Anumberthatwillbecountedis2.Difinea*btobethelargerof2aanda+bThen(2*3)*(3*2)isequalto3.Tomelivedaquarterofhislifeasaboy,afifthasayoungman

题目详情
1.Starting at 777 and counting backwards by 7s a student counts 777,770,763,etc.A number that will be counted is
2.Difine a*b to be the larger of 2a and a+b Then (2*3)*(3*2)is equal to
3.Tome lived a quarter of his life as aboy,a fifth as a young man ,a third in middle age and 13 years in retirement.How old was he when he died?
急…………………………
▼优质解答
答案和解析
1、从777开始数,每次向前数7,一个学生数了777 770 763等,接下来的是?
763-7=756
2、 定义a*b为 2a和 a+b中大的一个,那么(2*3)*(3*2)=?
2*3中.2a=4,a+b=2+3=5 则2*3=5
3*2中,2a=6,则3*2=6
原式=11
中间的*不是乘,而是公式里的“*”,一楼的你好像错了
3、汤姆的一生中,四分之一式小孩,五分之一式青年,三分之一式中年,13年是退休,当他死的时候他多大?
设他死时为X岁
1/4*x+1/5*x+1/3*x+13=x
则x=60
答:他死的时候60岁