求A同B 有3條數

2007-01-04 4:44 am
第一題:
Ax+( A - B )≡ 3x + 7

第二題:
( A+B ) x - A ≡ - 2x - 1

第三題:
( A-B ) x + A ≡ 6x + 1
更新1:

仲有一條~SOR 2Ax - B ≡ 9 -3x

回答 (3)

2007-01-04 4:52 am
1. comparing the like terms

Ax=3x
A=3
A-B=7
3-B=7
B=-4

2.A=1
(A-B)x=2x
A-B=2
1-B=2
B=-1

3.A=1
(A-B)x=6x
(A-B)=6
1-B=6
B=-5
2007-01-04 4:52 am
1.) Ax+( A - B )≡ 3x + 7
A=3
因為A-B=7
3-B=7
B=-4

2.)( A+B ) x - A ≡ - 2x - 1
-A=-1
A=1
因為A+B=-2
1+B=-2
B=-3

3.)( A-B ) x + A ≡ 6x + 1
A=1
因為A-B=6
1-B=6
B=-5
2007-01-04 4:52 am
1. compare the 2 sides
A = 3
A - B = 7
3 - B = 7
B= -4
2. compare the 2 sides
A=1
A+B = -2
1+B = -2
B = -3
3. compare the 2 sides
A = 1
A -B = 6
1 - B = 6
B = -5
參考: maths


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