求解以下數學題，附步驟
If x=2,y=3 and z=5, find the value
a)4x-2y
b)(7x+6y)(4y-5z)
Thank You very much!!!
求解S.1數學題
2014-06-14 12:13 am
回答 (9)
2014-06-14 12:23 am
✔ 最佳答案
Cherry 同學你好~ (◕‿◕✿)對於這類代數題，你必需好好掌握當中的做法和準繩度。
這對你將來學數學是很重要的。
If x = 2, y = 3 and z = 5, find the value of the following.
(a) 4x - 2y
= 4(2) - 2(3)
= 8 - 6
= 2
(b) (7x + 6y)(4y - 5z)
= [7(2) + 6(3)][4(3) - 5(5)]
= (14 + 18)(12 - 25)
= (32)(-13)
= -416
2014-06-16 6:09 pm
a)
4x-2y
=4*2-2*3
=2
b)
(7x+6y)(4y-5z)
=28xy-35xz-30yz+24y^2
=28(2)(3)-35(2)(5)-30(3)(5)+24(9)
=-416
4x-2y
=4*2-2*3
=2
b)
(7x+6y)(4y-5z)
=28xy-35xz-30yz+24y^2
=28(2)(3)-35(2)(5)-30(3)(5)+24(9)
=-416
2014-06-16 12:04 am
(a) 4x - 2y
= 4(2) - 2(3)
= 8 - 6
= 2
(b) (7x + 6y)(4y - 5z)
= [7(2) + 6(3)][4(3) - 5(5)]
= (14 + 18)(12 - 25)
= (32)(-13)
= -416
= 4(2) - 2(3)
= 8 - 6
= 2
(b) (7x + 6y)(4y - 5z)
= [7(2) + 6(3)][4(3) - 5(5)]
= (14 + 18)(12 - 25)
= (32)(-13)
= -416
2014-06-15 8:57 pm
If x=2,y=3 and z=5
a)4x-2y
=4x2-2x3
=8-6
=2
b)(7x2+6x3)(4x3-5x5)
=32x-13
=-416
a)4x-2y
=4x2-2x3
=8-6
=2
b)(7x2+6x3)(4x3-5x5)
=32x-13
=-416
2014-06-14 7:41 pm
a)4x-2y
=4*2-2*3
=8-6
=2
b)(7x+6y)(4y-5z)
=(7*2+6*3)*(4*3-5*5)
=(14+18)*(12-25)
=32*-13
=-416
=4*2-2*3
=8-6
=2
b)(7x+6y)(4y-5z)
=(7*2+6*3)*(4*3-5*5)
=(14+18)*(12-25)
=32*-13
=-416
2014-06-14 4:53 am
a) 4x-2y
=(4*2)-(2*3)
=8-6
=2
the value is 2
b) (7x+6y)(4y-5z)
=(7*2+6*3)*(4*3-5*5)
=(14+18)*(12-25)
=32*-13
=-416
the value is -416
=(4*2)-(2*3)
=8-6
=2
the value is 2
b) (7x+6y)(4y-5z)
=(7*2+6*3)*(4*3-5*5)
=(14+18)*(12-25)
=32*-13
=-416
the value is -416
參考: me
2014-06-14 2:31 am
4X2-2X3=2
(7X2+6X3)(4X3-5X5)=32X2=64
(7X2+6X3)(4X3-5X5)=32X2=64
2014-06-14 12:44 am
I am a F.4 student :)
a:
4x - 2y
= 4(2) - 2(3)
= 8 - 6
= 2
b:
(7x + 6y) (4y - 5z)
= [7(2) + 6(3)] [4(3) - 5(5)]
= (14 + 18) (12 - 25)
= (32) (-13)
= -416
a:
4x - 2y
= 4(2) - 2(3)
= 8 - 6
= 2
b:
(7x + 6y) (4y - 5z)
= [7(2) + 6(3)] [4(3) - 5(5)]
= (14 + 18) (12 - 25)
= (32) (-13)
= -416
參考: my knowledge
收錄日期: 2021-04-15 15:49:02
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20140613000051KK00080