2x + 3y = 27 - 2x y = 2 + x. 答案： x = y =?

👨🏻‍🏫 學術台數學

Ding

2015-12-07 11:12 am

回答 (1)

[匿名]

2015-12-07 1:58 pm

2x+3y= 27-2x
4x+3y=27....(1)

y=2+x
y-x=2
4y-4x=8....(2)

(1)+(2)
7y=35
y=5帶回(1)
4x+3*5=27
4x=27-15=12
x=3

x=3
y=5

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