math~T^T

2009-08-09 2:54 am

T^T唔識計~
(10-2x)X9/2=(7-x)
x=?

回答 (3)

2009-08-09 3:03 am

✔ 最佳答案

(10-2x)X9/2=(7-x)
9/2(10)+9/2(-2x)=7-x
45-9x=7-x
45-7=9x-x
38=8x
38/8=8x/8
19/4=x
x=19/4

2009-08-08 19:06:08 補充：
x is also =4.75

參考: By Calculation

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2009-08-09 3:33 am

(10-2x)x(9/2) = 7- x
(10)(9/2) - (2x)(9/2) = 7-x
45-9x = 7-x
45-7 =-x+9x
38 = 8x
x = 4.75

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2009-08-09 3:09 am

(10-2x)X9/2=7-x
(10-2x)X4.5=7-x
(10X4.5)-(2xX4.5)=7-x
45-9x=7-x
45-9x+9x=7-x+9x
45=7+8x
45-7=7+8x-7
38=8x
38/8=8x/8
4.75=x
x=4.75

參考: me

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