作业帮1.Of 40 pairs of socks in a drawer,X pairs are solid white,Y pairs are solid gray,and more than 19 of the pairs are striped.比较两项:X-Y; The number of striped pairs of socks in the drawer(正确答案右项大于左项)2.A buyer pays a $1.00 tax
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1.Of 40 pairs of socks in a drawer,X pairs are solid white,Y pairs are solid gray,and more than 19 of the pairs are striped.比较两项:X-Y; The number of striped pairs of socks in the drawer(正确答案右项大于左项)2.A buyer pays a $1.00 tax
1.Of 40 pairs of socks in a drawer,X pairs are solid white,Y pairs are solid gray,and more than 19 of the pairs are striped.
比较两项:X-Y; The number of striped pairs of socks in the drawer
(正确答案右项大于左项)
2.A buyer pays a $1.00 tax on an item that costs $10.00 after the tax is added.
比较两项:The percentage rate of the tax; 11%
(正确答案左项大于右项)
3.A certain five-member committee must be assembled from a pool of five women-A,B,C,D,E,and three men-X,Y,Z,what is the probability that the committee will include B,C,E,Y,
A.1/30 B.1/25 C.2/35 D.1/15 E/3/32 (正确为A)
4.In the series {N1,N2,N3,……,Nx},N1=1,and N(x+1)=-|Nx + 1|.(即第X+1项的值等于第X项的值加1的绝对值的相反数)
比较两项:N2-N3; N4-N5
正确答案为两项相等.
1.Of 40 pairs of socks in a drawer,X pairs are solid white,Y pairs are solid gray,and more than 19 of the pairs are striped.比较两项:X-Y; The number of striped pairs of socks in the drawer(正确答案右项大于左项)2.A buyer pays a $1.00 tax
1.striped>19 => x+y=20,因此 右边 >= 左边
2.假设税率x,原价是9.then 9x=1 => x=0.111111 > 0.11
3.题目可以简化为从8选5,任一组合出现的概率,答案应该是1/56.莫非有其它限制条件?
4.硬推：N2=-2,N3=1,N4=-2,N5=1.