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x and y are integers such that 0<y<x. H = 100x+10x+4 G = 100y+10y+2 M = (H−G)(H+G) Quantity A: The units digit of M Quantity B:
x and y are integers such that 0<y<x. H = 100x+10x+4 G = 100y+10y+2 M = (H−G)(H+G) Quantity A: The units digit of M Quantity B:
admin
2019-10-11
11
问题
x and y are integers such that 0<y<x.
H = 100x+10x+4
G = 100y+10y+2
M = (H−G)(H+G)
Quantity A: The units digit of M
Quantity B: 2
选项
A、Quantity A is greater.
B、Quantity B is greater.
C、The two quantities are equal.
D、The relationship cannot be determined from the information given.
答案
C
解析
H-G=100(x-y)+10(x-y)+2,个位为2(题目条件为x>y,对个位没有影响;若x<y则个位为8)。H+G=100(x+y)+10(x+y)+6,个位为6。显然2×6=12,个位为2,故答案为C。
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