Simplify the following algebraic expressions.
1. 8x+4/2 - (3x-2)
2. 5(a-1)/2 - 4(a+1)/3
3. (2m+5/2) - (m-1/4)
4. 6*(2a+7/3) +4* (3a-5/2)
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小六升中一數學問題
2010-08-26 4:57 am
回答 (3)
2010-08-29 12:00 am
✔ 最佳答案
1)8x+4/2-(3x-2)
=8x+2-3x+2
=5x+4
2)
5(a-1)/2-4(a+1)/2
=(15a-15-8a-8)/6
=(7a-3)/6
3)
(2m+5/2)-(m-1/4)
=2m+5/2-m+1/4
=m+10/4+1/4
=m+11/4
4)
6(2a+7/3)+4(3a-5/2)
=12a+14+12a-10
=24a+4
=4(6a+1)
2010-09-04 6:01 am
1. 8x+4/2 - (3x-2)
=8x+4/2-3x+2
=8x-3x+4/2+2
=5x+2+2
=5x+4
2. 5(a-1)/2 - 4(a+1)/3
=6X{5(a-1)/2} - {4(a+1)/3}X6
=3[5(a-1)]-[4(a+1)X2]
=3(5a-5)-2(4a+4)
=15a-15-8a-8
=15a-8a-15-8
=7a-7
3. (2m+5/2) - (m-1/4)
=2m+5/2-m+1/4
=2m-m+5/2+1/4
=m+10/4+1/4
=m+11/4
=m+2右3/4
2010-09-03 22:03:20 補充：
6(2a+7/3)+4(3a-5/2)
=12a+14+12a-10
=24a+4
=4(6a+1)
=8x+4/2-3x+2
=8x-3x+4/2+2
=5x+2+2
=5x+4
2. 5(a-1)/2 - 4(a+1)/3
=6X{5(a-1)/2} - {4(a+1)/3}X6
=3[5(a-1)]-[4(a+1)X2]
=3(5a-5)-2(4a+4)
=15a-15-8a-8
=15a-8a-15-8
=7a-7
3. (2m+5/2) - (m-1/4)
=2m+5/2-m+1/4
=2m-m+5/2+1/4
=m+10/4+1/4
=m+11/4
=m+2右3/4
2010-09-03 22:03:20 補充：
6(2a+7/3)+4(3a-5/2)
=12a+14+12a-10
=24a+4
=4(6a+1)
參考: me
2010-08-26 5:27 am
1)
(8x + 4) / 2 - (3x - 2)
= 4x + 2 - 3x + 2
= x + 4
2)
5(a - 1) / 2 - 4(a + 1) / 3
= [15(a - 1) - 8(a + 1)] / 6
= (7a - 23) / 6
3)
(2m + 5) / 2 - (m - 1) / 4
= [2(2m + 5) - (m - 1)] / 4
= (3m + 11) / 4
4)
6 * (2a + 7) / 3 + 4 * (3a - 5) / 2
= 2(2a + 7) + 2(3a - 5)
= 10a + 4
(8x + 4) / 2 - (3x - 2)
= 4x + 2 - 3x + 2
= x + 4
2)
5(a - 1) / 2 - 4(a + 1) / 3
= [15(a - 1) - 8(a + 1)] / 6
= (7a - 23) / 6
3)
(2m + 5) / 2 - (m - 1) / 4
= [2(2m + 5) - (m - 1)] / 4
= (3m + 11) / 4
4)
6 * (2a + 7) / 3 + 4 * (3a - 5) / 2
= 2(2a + 7) + 2(3a - 5)
= 10a + 4
參考: My Maths Knowledge
收錄日期: 2021-04-13 17:27:58
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