一條比較複雜既數學方程

分3個部份:

4x+2/2 = 2x+1

2(4x+2) = 8x+4

4x+2 唔駛轉

成條式變左

2x+1+8x+4+4x+2=60

2x+8x+4x+1+4+2=60

14x+7=60

14x=52

x=52/14

x=3.71(corr.to 3sig.)

2007-09-08 09:06:43 補充：
14x=53x=53/14x=3.79(corr.to 3sig.)打錯左

[ ( 4x + 2 ) / 2 ] + [ 2 ( 4x + 2 ) ] + ( 4x + 2 ) = 60
( 4x + 2 ) ( 1/2 + 2 + 1 ) = 60
( 7 / 2 ) ( 4x + 2 ) = 60
4x + 2 = 120 / 7
4x = 106 / 7
x = 53 / 14

[(4x+2)/2]+[2(4x+2)]+(4x+2)=60
2x+1+8x+4+4x+2=60
14x=53
x=53/14

[(4x+2)/2]+[2(4x+2)]+(4x+2)=60

(2x + 1) + (8x + 4) + 4x + 2 = 60
2x + 8x + 4x + 1 + 4 + 2 = 60
14x + 7 = 60
14x = 53
x = 3.79 (cor. to 3.sig.fig)

[(4x+2)/2]+[2(4x+2)]+(4x+2)=60
(4x+2)+4(4x+2)+2(4x+2)=120 成條式乘2
4x+2+16x+8+8x+4=120
28x+14=120
28x=106
x=53/14

[(4x+2)/2]+[2(4x+2)]+(4x+2)=60
[(4x+2)/2]+8x+4+4x+2=60
2{[(4x+2)/2]+8x+4+4x+2}=60(2)
4x+2+16x+8+8x+4=120
28x+14=120
28x=106
x=3/11/14