問數學2題!!(急....)

2006-10-23 9:09 am

2x +5= 9+4

7y -11y + 3=15

回答 (4)

2006-10-23 9:12 am

✔ 最佳答案

2x +5= 9+4
2x +5 = 13
2x = 13 - 5
2x = 8
x = 8/2
x = 4

7y -11y + 3=15
-4y = 15 - 3
-4y = 12
y = 12/(-4)
y = -3

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2006-10-24 6:43 pm

2x + 5 = 9 + 4
2x = 13 - 5
2x = 8
x = 4

7y - 11y + 3 = 15
-4y = 15 - 3
-4y = 12
y = -3

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2006-10-23 11:01 pm

2x+5=9+4
2x=9+4-5
2x=8
x=4

7y -11y + 3=15
-4y=15-3
-4y=12
y=-3

參考: me

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2006-10-23 9:14 am

2x+5=9+4
2x+5=13
2x=13-5
2x=8
x=4

****************
7y-11y=15-3
-4y=12
y=-3

參考: 自己~

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