化簡
1.a-(2a-b)
2.-6a2次方+(5ab-3a2次方b)
3.(3x+4y)+(x-2y)
4.(5x+7y)-(8x-6y)
要有過程
有數學唔識做？？
2007-07-28 2:55 am
回答 (2)
2007-07-28 3:06 am
✔ 最佳答案
1)a-(2a-b)=a-2a+b
= -a+b
3)(3x+4y)+(x-2y)
=3x+4y+x-2y
=4x+2y
=2(2x+y)
4) (5x+7y)-(8x-6y)
=5x+7y-8x+6y
=-3x+13y
第2唔係好明你個2次方b係咩黎
係(3a^2)b定係3a^2b???
2007-07-27 19:24:52 補充：
樓上個位你第3題好明係冇抽common factor咁係錯架
2007-07-28 3:02 am
1.a-(2a-b)
=a-2a+b
= -a+b
2.-6a2次方+(5ab-3a2次方b)
=-6a2次方+5ab-3a2次方b
=-3a2次方b-6a2次方+5ab
3.(3x+4y)+(x-2y)
=3x+4y+x-2y
=4x+2y
4.(5x+7y)-(8x-6y)
=5x+7y-8x+6y
= -3x+13y
=a-2a+b
= -a+b
2.-6a2次方+(5ab-3a2次方b)
=-6a2次方+5ab-3a2次方b
=-3a2次方b-6a2次方+5ab
3.(3x+4y)+(x-2y)
=3x+4y+x-2y
=4x+2y
4.(5x+7y)-(8x-6y)
=5x+7y-8x+6y
= -3x+13y
收錄日期: 2021-04-12 20:41:05
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