1) p=3(ax-bx) Make x the subject of the formula.
2)Solve for x : mx+n=nx , a(x-b)=x , y=2 over x-1
3)A ladder 13 m long reaches 12m up a wall. How far from the wall is the foot of the ladder ?
4) Find the area of a square with its diagonal 95 cm long.
5)Expand: a) (pq - rs)2 b) ( x - y + z)2
6)A wire, 32 cm long, is bent into the shape of a quadrant. Find the area enclosed by the wire.
maths question
2007-07-04 6:45 pm
回答 (2)
2007-07-04 8:31 pm
✔ 最佳答案
1) p = 3(ax-bx)p = 3x(a-b)
x = p/ 3(a-b)
第二題唔明寫咩
3) (13x 13- 12x12) Square root...
= 5 m (Pythagorus theorem)
4) Let x cm be the side of the square
x^2 + x^2 = 95^2
2x^2=9025
x^2 = 4512.5
Because area = x^2
So area is 4512.5 cm2
5) a) (pq-rs)2
= 2pq-2rs
b) (x-y+z)2
= 2x-2y+2z
6) Let the radius be r cm
2r + [2(3.14)(r)]/4 = 32
2r + 6.28r /4=32
2r+ 1.57r =32
r=8.96
Area = 3.14 (r)(r)/4
= 63 cm^2
2007-07-06 5:07 am
2a
mx+n=nx
(m-n)x=-n
x=(n-m)/n
2b
ax-ab=x
(a-1)x=ab
x=ab/(a-1)
2c
y=2/(x-1)
x-1=2/y
x=(2/y)-1
mx+n=nx
(m-n)x=-n
x=(n-m)/n
2b
ax-ab=x
(a-1)x=ab
x=ab/(a-1)
2c
y=2/(x-1)
x-1=2/y
x=(2/y)-1
收錄日期: 2021-04-12 20:04:42
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