If x = 4, x + y = 7, and x + z = 8, what is the value of x + y + z? A. 9 B. 17 C. 11 D. 19——青夏教育精英家教网——

摘要：If x = 4, x + y = 7, and x + z = 8, what is the value of x + y + z? A. 9 B. 17 C. 11 D. 19

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be a four-digit number．If

is a square of an integer，then A=

．（英汉词典：four-digit number 四位数；square平方、平方数；integer整数）查看习题详情和答案>>

If N is natural number and N＜

＜N+1，then the value of N is

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16、If a²+a=0，then result of a²⁰¹¹+a²⁰¹⁰+2010 is

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Let a be integral part of

and b be its decimal part．Let c be the integral part of π and d be the decimal part． if ad-bc=m，then（　　）
（英汉词典：integralpart整数部分；decimalpart小数部分）

A、-2＜m＜-1

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If x=2 is a solution of the epuation

+4)-7]+10}=1，then a=

．
（英汉词典：solution解；epuation方程）查看习题详情和答案>>