Why does it help to rearrange addends in Example B to show that 2.5n +9.9+(-3n) is equal to 2.5n + (-3n) + 9.9?

Question

Why does it help to rearrange
addends in Example B to show that
2.5n +9.9+(-3n) is equal to
2.5n + (-3n) + 9.9?

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Thu Giang 2 months 2021-07-30T00:06:41+00:00 1 Answers 3 views 0

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  1. ngockhue
    0
    2021-07-30T00:08:25+00:00
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    Answer:

    You don’t really need to do it, but it helps you keep things more organized and easier to follow. Imagine if you’re doing some multi-variable equation,

    2a + 5b + 4d + 3c + b + a + 2d

    that looks like a mess, it’ll be easier to look at if you put all the similar variables next to each others like this:

    a + 2a + b + 5b + 3c + 2d + 4d

    (a + 2a) + (b + 5b) + 3c + (2d + 4d)

    now you can add them up much easier.

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )