Help;p不懂做Maths

2009-10-15 5:56 am
Help;p不懂做Maths
列步驟 '
15=10-b/2
answer係-20
更新1:

10-b/2即係(10-b)÷2

回答 (4)

2009-10-16 4:55 am
15=10-b/2
15*2=10-b
10-30=b
b=-20
2009-10-16 3:01 am
15 = (10 - b) / 2

15 X 2 = [(10 - b) / 2] X 2

30 = 10 - b

30 - 10 = 10 - b - 10

20 = -b

-b = 20

-(-b) = -20

b = -20
2009-10-15 6:40 am
2009-10-15 6:20 am
15 = (10 - b) / 2

15 X 2 = [(10 - b) / 2] X 2

30 = 10 - b

30 - 10 = 10 - b - 10

20 = -b

-b = 20

-(-b) = -20

b = -20
參考: Physics king


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