10maks 的maths question
回答 (3)
2007-12-24 12:05 am
2y+3-4(y+3) = -7
2y+3-4y-12 = -7.............(拆括孤記住轉符號!!!!)
-2y = -7-3+12
y = -1
2y+3-4y-12 = -7.............(拆括孤記住轉符號!!!!)
-2y = -7-3+12
y = -1
2007-12-23 11:50 pm
2y+3-4(y+3)=-7
2y+3-4y-12=-7
-2y+(-9)=-7
-2y-9=-7
-2y=-7+9
-2y 2
----= -----
-2 -2
y=-1
2y+3-4y-12=-7
-2y+(-9)=-7
-2y-9=-7
-2y=-7+9
-2y 2
----= -----
-2 -2
y=-1
參考: myself!!!!
2007-12-23 10:46 pm
2y+3-4(y+3)=-7
2y+3-4y-12=-7 (唔係+12)[因為(-4)(3)=-12,負正得負]
-2y-9=-7
-2y=2
y=-1
2y+3-4y-12=-7 (唔係+12)[因為(-4)(3)=-12,負正得負]
-2y-9=-7
-2y=2
y=-1
收錄日期: 2021-04-25 17:19:15
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