有數學唔識做？？

2007-10-31 3:31 am

✔ 最佳答案

1.(3x - 2)+(2x - 3)
= 3x - 2+2x - 3
= 5x - 5

2.(2x - 3x2)+(9x2-x)
= 2x - 3x2+9x2- x
= 6x2+ x

3.(x2- 3x)+(12x+25x2)
= x2- 3x+12x+25x2
= 26x2+ 9x

4.(2x2+6x)+(5x2+3)
= 2x2+6x+5x2+3
= 7x2+6x+3

5.(4x2+3x)+(5x2+7x)
= 4x2+3x+5x2+7x)
= 9x2+10x

2007-10-30 19:33:42 補充：
只有同項的先可以相加如x^2可以和x^2相加

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用戶214563

2007-11-03 5:00 am

1.(3x-2)+(2x-3)
=3x-2+2x-3
=3x+2x-2-3
=5x-5

2.(2x-3x^2)+(9x^2-x)
=2x-3x^2+9x^2-x
=2x-x-3x^2+9x^2
=x+6x^2

3.(x^2-3x)+(12x+25x^2)
=x^2-3x+12x+25x^2
=x^2+25x^2-3x+12x
=26x^2+9x

4.(2x^2+6x)+(5x^2+3)
=2x^2+6x+5x^2+3
=2x^2+5x^2+6x+3
=7x^2+6x+3

5.(4x^2+3x)+(5x^2+7x)
=4x^2+3x+5x^2+7x
=4x^2+5x^2+3x+7x
=9x^2+10x

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AJJS

2007-11-01 12:42 am

1)(3x-2)+(2x-3)
=3x -2 +2x -3
=3x+2x -2-3
=5x-5

2)(2x-3x2次方)+(9x2次方-x)
=2x -3x2次方 +9x2次方 -x
=2x-x -3x2次方+9x2次方
=x+6x2次方

3)(x2次方-3x)+(12x+25x2次方)
=x2次方 -3x +12x +25x2次方
=x2次方+25x2次方 -3x+12x
=26x2次方+9x

4)(2x2次方+6x)+(5x2次方+3)
=2x2次方 +6x +5x2次方 +3
=2x2次方+5x2次方 +6x+3
=7x2次方+6x+3

5)(4x2次方+3x)+(5x2次方+7x)
=4x2次方 +3x +5x2次方 +7x
=4x2次方+5x2次方 +3x+7x
=9x2次方+10x

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fungtc1793

2007-10-31 4:01 am

1.(3x-2)+(2x-3)
=3x - 2+2x - 3
=5x - 5

2.(2x-3x2次方)+(9x2次方-x)
=2x - 3x2+9x2- x
=6x2+ x

3.(x2次方-3x)+(12x+25x2次方)
=x2- 3x+12x+25x2
=26x2+ 9x

4.(2x2次方+6x)+(5x2次方+3)
=2x2+6x+5x2+3
=7x2+6x+3

5.(4x2次方+3x)+(5x2次方+7x)
=4x2+3x+5x2+7x)
= 9x2+10x
希望幫到你！

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kwansum

2007-10-31 3:43 am

1.(3x-2)+(2x-3)
=3x-2+2x-3
=3x+2x-2-3
=5x-5

2.(2x-3x^2)+(9x^2-x)
=2x-3x^2+9x^2-x
=-3x^2+9x^2+2x-x
=6x^2+x

3.(x^2- 3x)+(12x+25x^2)
=x^2- 3x+12x+25x^2
=x^2+25x^2-3x+12x
=26x^2+ 9x

4.(2x^2+6x)+(5x^2+3)
=2x^2+6x+5x^2+3
=2x^2+5x^2+6x+3
=7x^2+6x+3

5.(4x^2+3x)+(5x^2+7x)
=4x^2+3x+5x^2+7x
=4x^2+5x^2+3x+7x
=9x^2+10x

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Fung

2007-10-31 3:41 am

1.(3x-2)+(2x-3)
=3x-2+2x-3
=3x+2x-2-3
=5x-5

2.(2x-3x^2)+(9x^2-x)
=2x-3x^2+9x^2-x
=-3x^2+9x^2+2x-x
=6x^2+x

3.(x^2- 3x)+(12x+25x^2)
=x^2- 3x+12x+25x^2
=x^2+25x^2-3x+12x
=26x^2+ 9x

4.(2x^2+6x)+(5x^2+3)
=2x^2+6x+5x^2+3
=2x^2+5x^2+6x+3
=7x^2+6x+3

5.(4x^2+3x)+(5x^2+7x)
=4x^2+3x+5x^2+7x
=4x^2+5x^2+3x+7x
=9x^2+10x

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用戶195871

2007-10-31 3:38 am

1.3x+2x-2-3
=5x-5

2.2x-x+9x2次方-
=x+6x2次方

3.x2次方+25x2次方-3x+12x
=x2次方+25x2次方+9x

4.2x2次方+5x2次方+6x+3
=7x2次方+6x+3

5.4x2次方+5x2次方+3x+7x
=9x2次方+10x

參考: by myself

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[匿名]

2007-10-31 3:36 am

1.(3x - 2)+(2x - 3)
= 3x - 2+2x - 3
= 5x - 5

2.(2x - 3x2)+(9x2-x)
= 2x - 3x2+9x2- x
= 6x2+ x

3.(x2- 3x)+(12x+25x2)
= x2- 3x+12x+25x2
= 26x2+ 9x

4.(2x2+6x)+(5x2+3)
= 2x2+6x+5x2+3
= 7x2+6x+3

5.(4x2+3x)+(5x2+7x)
= 4x2+3x+5x2+7x)
= 9x2+10x

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回答 (8)