有8絛數學唔識做

2006-10-25 8:08 am
1.x-18=-5
2.y-26=-26
3..x-5=-9
4.x-15=-31
5.x-23=-19
6.3x+2=11
7.4x+5=13
8.6y+12=20
(要有過程和答案)

回答 (6)

2006-10-25 8:15 am
✔ 最佳答案
1.x-18=-5
x-18+18=-5+18
x = 13

2.y-26=-26
y-26+26 = -26 +26
y = 0

3..x-5=-9
x-5+5= -9+5
x = -4

4.x-15=-31
x-15+15 = -31 +15
x = -16

5.x-23=-19
x-23+23= -19+23
x = 4

6.3x+2=11
3x+2-2= 11-2
3x = 9
3x/3=9/3
x=3

7.4x+5=13
4x +5-5= 13-5
4x = 8
4x/4 = 8/4
x = 2

8.6y+12=20
6y+12-12 = 20 - 12
6y =8
6y/6 = 8/6
y = 4/3
參考: myself
2006-10-25 8:25 am
1. x-18=-5
x=-5+18
x=13

2. y-26=-26
y=-26+26
y=0

3. x-5=-9
X=-9+5
X=-4

4. x-15=-31
X=-31+15
X=-16

5. x-23=-19
X=-19+23
X=4

6. 3x+2=11
3X=11-2
X=9/3
X=3

7. 4x+5=13
4X=13-5
X=8/4
X=2

8. 6y+12=20
6y=20-12
y=8/6
y=4/3
參考: 自己
2006-10-25 8:23 am
1. x-18= -5
x=-5+18
x=13
2. y-26=-26
y=-26+26
y=0
3 x-5=-9
x=-9+5
x=-4
4. x-15=-31
x=-31+15
x=-16
5. x-23=-19
x=-19+23
x=4
6. 3x+2=11
3x=11-2
3x=9
x=3
7. 4x+5=13
4x=13-5
4x=8
x=2
8. 6y+12=20
6y=20-12
6y=8
y=8/6
y=1 1/3
2006-10-25 8:20 am
1.x-18=-5
x-18+18=-5+18
x=13

2.y-26=-26
y-26+26=-26+26
y=0

3..x-5=-9
x-5+5=-9+5
x=-4

4.x-15=-31
x-15+15=-31+15
x=-16

5.x-23=-19
x-23+23=-19+23
x=4

6.3x+2=11
3x+2-2=11-2
3x=9
3x/3=9/3
x=3
7.4x+5=13
4x+5-5=13-5
4x=8
4x/4=8/4
x=2

8.6y+12=20
6y+12-12=20-12
6y=8
6y/6=8/6
y=1 1/3
2006-10-25 8:17 am
1.x-18=-5
x=-5+18
x=13
2.y-26=-26
y=0
3..x-5=-9
x=-9+5
x=4
4.x-15=-31
x=-31+15
x=-16
5.x-23=-19
x=-19+23
x=4
6.3x+2=11
3x=11-2
x=9/3
x=3
7.4x+5=13
4x=13-5
x=8/4
x=2
8.6y+12=20
6y=20-12
y=8/6
y=4/3
2006-10-25 8:15 am
1) x-18=-5
 x = -5+18
 x = 13

2) y-26=-26
 y = -26+26
 y = 0

3) x-5=-9
 x =-9+5
 x = -4

4) x-15=-31
 x = -31+15
 x = -16

5) x-23=-19
 x = -19+23
 x = 4

6) 3x+2=11
 3x = 11-2
 3x = 9
 x = 3

7) 4x+5=13
 4x = 13-5
 4x = 8
 x = 2

8) 6y+12=20
 6y = 20-12
 6y = 8
 y = 1.3333(4 d.p.)


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