plz help me to answer the question,if you do not know the answer,plz answer no~I need the steep~Thank for your help~
1)Simplify the following:
(A) (6x-13/4x-8)+(7-3x/4x-8)
2)Make x the subject of the formula y=x+2/x-3.
F.2 mathz
2007-09-30 7:44 am
回答 (2)
2007-09-30 7:54 am
✔ 最佳答案
1.(a)( 6x - 13 ) / ( 4x - 8 ) + ( 7 - 3x ) / ( 4x - 8 )
= ( 6x - 13 + 7 - 3x ) / ( 4x - 8 )
= ( 3x - 6 ) / ( 4x - 8 )
= 3 ( x - 2 ) / 4 ( x - 2 )
= 3 / 4
2.
y = ( x + 2 ) / ( x - 3 )
y ( x - 3 ) = x + 2
xy - 3y = x + 2
xy - x = 3y + 2
x ( y - 1 ) = 3y + 2
x = ( 3y + 2 ) / ( y - 1 )
2007-09-30 7:55 am
1(a)
(6x-13/4x-8)+(7-3x/4x-8) (因為分母相同, 所以分子可以直接相加)
=3x-6/4x-8 (抽公因子(x-2))
=3(x-2)/4(x-2)
=3/4
2) y=x+2/x-3
y(x-3)=x+2
xy-3y=x+2
xy-x=2+3y
x(y-1)=2+3y
x=(2+3y)/(y-1)
(6x-13/4x-8)+(7-3x/4x-8) (因為分母相同, 所以分子可以直接相加)
=3x-6/4x-8 (抽公因子(x-2))
=3(x-2)/4(x-2)
=3/4
2) y=x+2/x-3
y(x-3)=x+2
xy-3y=x+2
xy-x=2+3y
x(y-1)=2+3y
x=(2+3y)/(y-1)
參考: 自己
收錄日期: 2021-04-13 13:40:44
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