plz help me to answer the question,if you do not know the answer plz answer no~i need the step~Thanks for your help~
(a)Make x the subject in each of the following formulae.
1) y=3-2x
2) y=5+4x/3
3) y-5=2x+3/6
(B)
1)Make w the subject of the formula P=2(L+w)
2)Make b the subject of the formula A=1/2(a+b)h
(C)
1)Make x the subject of the formula y=3x/x+3
2)Make x the subject of the formula y=4+x/3-x
F.2 maths plz help me ~quick
2007-09-28 1:50 am
回答 (3)
2007-09-28 2:01 am
✔ 最佳答案
a1)2x=3-yx=(3-y)/2
a2)3y=15+4x
3y-15=4x
x=(3y-15)/4
a3)6y-30=12x+3
6y-33=12x
2y-11=4x
x=(2y-11)/4
b1)p=2l+2w
p-2l=2w
w=(p-2L)/2
b2)2A=ah+bh
2A-ah=bh
b=(2A-ah)/h
c1)y=3
x=0
[3x/x 可以約去x]
c2)3y=12+x-3x
2x=12-3y
x=(12-3y)/2
2007-09-28 2:04 am
(B)
1)Make w the subject of the formula P=2(L+w)
P=2(L+w)
P=2L+2w
P-2L=2w
P/2-L=w
w=P/2-L (/係除號)
2)Make b the subject of the formula A=1/2(a+b)h
A=1/2(a+b)h
1/A=2(a+b)h
b=(1/2Ah)-a
1)Make w the subject of the formula P=2(L+w)
P=2(L+w)
P=2L+2w
P-2L=2w
P/2-L=w
w=P/2-L (/係除號)
2)Make b the subject of the formula A=1/2(a+b)h
A=1/2(a+b)h
1/A=2(a+b)h
b=(1/2Ah)-a
2007-09-28 2:00 am
1. y=3-2x
y-3=-2x
x=(3-y)/2
2 y=5+4x/3
3y-15=4x
x=(3y-15)/4
3 Is it
y-5=(2x+3)/6?
6y-30=2x+3
x=(6y-33)/2
B1 P=2(L+w)
P/2=L+w
w=(P/2)-L
2 A=1/2(a+b)h
1/A=2(a+b)h
b=(1/2Ah)-a
C1 y=3x/(x+3)
xy-3x+3y=0
x(y-3)=3y
x=3y/(y-3)
2. y= (4+x)/(3-x)
3y-xy-4-x=0
-x(y+1)=4-3y
x=(3y-4)/(y+1)
y-3=-2x
x=(3-y)/2
2 y=5+4x/3
3y-15=4x
x=(3y-15)/4
3 Is it
y-5=(2x+3)/6?
6y-30=2x+3
x=(6y-33)/2
B1 P=2(L+w)
P/2=L+w
w=(P/2)-L
2 A=1/2(a+b)h
1/A=2(a+b)h
b=(1/2Ah)-a
C1 y=3x/(x+3)
xy-3x+3y=0
x(y-3)=3y
x=3y/(y-3)
2. y= (4+x)/(3-x)
3y-xy-4-x=0
-x(y+1)=4-3y
x=(3y-4)/(y+1)
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