又係中一既數學...一題唔識

2008-10-24 2:41 am

3a-7 = 5/4 (2-3a)

答案係38/27

要詳細d...超趕...最快答岩的有20分

回答 (5)

2008-10-25 8:05 am

3a-7 = 5/4 (2-3a)

3a-7 = (10-15a)/4

4(3a-7) =10-15a

12a-28 = 10-15a

12a+15a=38

27a=38

a=38/27

參考: me

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2008-10-24 5:06 am

3a-7 = 5/4 (2-3a)
3a-7 = 2.5-3.75a
3a =9.5-3.75a
6.75a=9.5
a=一又二十七分之十一

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2008-10-24 4:38 am

3a-7 = 5/4 (2-3a)

3a-7 = (10-15a)/4

4(3a-7) =10-15a

12a-28 = 10-15a

12a=10-15a+28

12a+15a=38

27a=38

a=38/27

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2008-10-24 3:24 am

3a-7 = 5/4 (2-3a)
3a-7 = (10-15a)/4
4(3a-7) =10-15a
a = 38/27

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2008-10-24 3:21 am

3a-7 = 5/4 (2-3a)

3a-7 = (10-15a)/4

4(3a-7) =10-15a

12a-28 = 10-15a

12a=10-15a+28

12a+15a=38

27a=38

a=38/27

參考: ME

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