1. 7 - x / 2 + 2 = 5
2 . 7 - x / 4 - 3 = 1
數學題.....................
2006-10-22 2:47 am
回答 (7)
2006-10-22 2:55 am
✔ 最佳答案
1) 7 - x/2 + 2 = 57 - x/2 + 2 - 5 = 0
7 + 2 - 5 = x/2
4 = x/2
4x2=x
8 = x
x=8
2) 7 - x/4 - 3 = 1
7 - x/4 - 3 - 1 = 0
7 - 3 - 1 = x/4
3 = x/4
3x4 = x
12 = x
x = 12
2006-10-22 4:11 am
1.
7-x/2+2=5-2
7-x/2=3
-(x/2)=3-7
-(x/2)=-4
-x=-4x2
-x=-8
x=8
2.
7-x/4-3=1
7-x/4=1+3
7-x/4=4
-(x/4)=4-7
-(x/4)=-3
-x=-3x4
-x=-12
x=12
Hope i can help u
7-x/2+2=5-2
7-x/2=3
-(x/2)=3-7
-(x/2)=-4
-x=-4x2
-x=-8
x=8
2.
7-x/4-3=1
7-x/4=1+3
7-x/4=4
-(x/4)=4-7
-(x/4)=-3
-x=-3x4
-x=-12
x=12
Hope i can help u
2006-10-22 3:03 am
Q 1. 7 - x / 2 + 2 = 5
7+2-5 = x / 2
4=x / 2
4*2=x
∴ x=8
Q 2. 7 - x / 4 - 3 = 1
7-3-1 = x / 4
3 = x / 4
3*4 = x
∴ x= 12
7+2-5 = x / 2
4=x / 2
4*2=x
∴ x=8
Q 2. 7 - x / 4 - 3 = 1
7-3-1 = x / 4
3 = x / 4
3*4 = x
∴ x= 12
2006-10-22 2:59 am
1. 7-x/2+2=5
-x/2=5-2-7
-x/2=-4
-x=-4*2
-x=-8
x=8
2. 7-x/4+2=1
-x/4=1-2-7
-x/4=-8
-x=-8*4
-x=-32
x=32
-x/2=5-2-7
-x/2=-4
-x=-4*2
-x=-8
x=8
2. 7-x/4+2=1
-x/4=1-2-7
-x/4=-8
-x=-8*4
-x=-32
x=32
2006-10-22 2:51 am
1. 7 - x / 2 + 2 = 5
4 = x/2
x = 8
2 . 7 - x / 4 - 3 = 1
3 = x/4
x = 12
4 = x/2
x = 8
2 . 7 - x / 4 - 3 = 1
3 = x/4
x = 12
2006-10-22 2:50 am
1.8
2.12
2.12
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