Simple Math Question?

👨🏻‍🏫 學術台數學

[匿名]

2016-02-24 6:25 am

In the equation
2500=x- 0.20x
2500=0.8x
3125=x

where did "0.8x' come from?

回答 (4)

andrew

2016-02-24 6:28 am

2500 = x - 0.20x
2500 = 1x - 0.20x
2500 = (1 - 0.20)x ...... Take out the common factor x.
2500 = 0.8x

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[匿名]

2016-02-24 6:43 am

1- 0.20

The "x" has a coefficient of "1"

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[匿名]

2016-02-24 6:30 am

2500 = x - 0.2x
2500 = x(1 - 0.2)
2500 = x(0.8)
x = 3125

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[匿名]

2016-02-24 6:28 am

It came from x - 0.20x. That operation was basically 1 - 0.2 but with an x added to it.

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