5x-7=3x-15
y=4(1-2y)
5(2y+1)=3(y-7)
方程式 help~help
2007-10-11 4:06 am
回答 (5)
2007-10-11 4:15 am
✔ 最佳答案
5x-7=3x-155x-3x=-15+7
2x=-8
x=-4
y=4(1-2y)
y=4-8y
9y=4
y=4/9
5(2y+1)=3(y-7)
10y+5=3y-21
7y=-26
y= -26/7
參考: 自己計~ =v=Y
2007-10-11 3:37 pm
1)5x-7=3x-15
5x=3x-15+7
5x=3x-8
5x-3x=-8
2x=-8
x=-4
2)y=4(1-2y)
y=4-8y
y+8y=4
9y=4
y=4/9
3)5(2y+1)=3(y-7)
10y+5=3y-21
10y-3y+5=21
7y+5=21
7y=21-5
7y=16
y=16/7
y=2 2/7
2007-10-11 07:38:15 補充：
y=-2 2/7
5x=3x-15+7
5x=3x-8
5x-3x=-8
2x=-8
x=-4
2)y=4(1-2y)
y=4-8y
y+8y=4
9y=4
y=4/9
3)5(2y+1)=3(y-7)
10y+5=3y-21
10y-3y+5=21
7y+5=21
7y=21-5
7y=16
y=16/7
y=2 2/7
2007-10-11 07:38:15 補充：
y=-2 2/7
2007-10-11 4:57 am
5x-7=3x-15
5x-3x=7-15
2x =-8
x =-4
y=4(1-2y)
y=4-8y
5(2y+1)=3(y-7)
10y+5 =3y-21
7y =-26
y =-3.71(corr.to 3 significant figures.)
2007-10-10 21:04:40 補充：
y=4(1-2y)y=4-8yy 8y=49y=4y =4/9
5x-3x=7-15
2x =-8
x =-4
y=4(1-2y)
y=4-8y
5(2y+1)=3(y-7)
10y+5 =3y-21
7y =-26
y =-3.71(corr.to 3 significant figures.)
2007-10-10 21:04:40 補充：
y=4(1-2y)y=4-8yy 8y=49y=4y =4/9
2007-10-11 4:18 am
1) 5x-7=3x-15
5X-3X=-15+7
2X = -8
X=-4
2) y=4(1-2y)
y=4-8y
y+8y=4
9y=4
y=4/9
3) 5(2y+1)=3(y-7)
10y+5=3y-21
10y-3y=-21-5
7y = -26
y=-26/7
5X-3X=-15+7
2X = -8
X=-4
2) y=4(1-2y)
y=4-8y
y+8y=4
9y=4
y=4/9
3) 5(2y+1)=3(y-7)
10y+5=3y-21
10y-3y=-21-5
7y = -26
y=-26/7
參考: ....
2007-10-11 4:16 am
1.2x=-8
x=-4
2.y=4-8y
9y=4
y=4/9
3.10y+5=3y-21
7y=-26
y=-26/7
x=-4
2.y=4-8y
9y=4
y=4/9
3.10y+5=3y-21
7y=-26
y=-26/7
收錄日期: 2021-04-18 23:30:25
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https://hk.answers.yahoo.com/question/index?qid=20071010000051KK03273