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受欢迎的 Word Problems >

The sum of three numbers is 79 . The second number is 2 times a number. The first number is 7 more than a number

解答

T h e s u m o f t h ree n u mb ers i s 79 . T h e seco n d n u mb er i s 2 t im es a n u mb er . T h e f i rs t n u mb er i s 7 m ore t han a n u mb er

解答

无解

求解步骤

Represent the numbers with

x, y, z

:

number 1 : x

number 2 : y

number 3 : z

A.T.Q.:

x + y + z = 79

y = 2 x

x = 7 + x

解方程组:

x + y + z = 79, y = 2 x, x = 7 + x :

无解

无解

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