中一數學功課,一題,10分!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

x+ 5(x+3)+ 2(x+3)+8=97
x+5x+15+2x+6+8=97
8x=97-28
8x=68
x=68/8
=17/2

驗算﹕
將x=17/2代入方程
x+ 5(x+3)+ 2(x+3)+8=97
17/2+5(17/2+3)+2(17/2+3)+8=97
17/2+5(17/2+6/2)+2(17/2+6/2)+16/2=97
17/2+5(23/2)+2(23/2)+16/2=97
17/2+115/2+46/2+16/2=97
194/2=97
97=97

所以﹕證明此方程的解正確。

x+ 5(x+3)+ 2(x+3)+8=97
x+ 5x+15+2x+6+8=97
8x+15+6+8=97
8x=97-29
8x=68
x=8.5
過程在here!!!
I hope I can help you!!!
投我牙..............

2007-11-22 20:00:10 補充：
^o^投我牙..............

x + 5 ( x + 3 ) + 2 ( x + 3 ) + 8 = 97

x + 5x + 15 + 2x + 3 + 8 = 97

x + 5x + 2x = 97 - 15 - 3 -8
8x = 71
x = 71 / 8 ( 起中學可以用假份數，不過要約減。)

x+ 5(x+3)+ 2(x+3)+8=97
(x+3)+5(x+3)+ 2(x+3)+5=97
(x+3)(1+5+2)=97-5
(x+3)=92/8
X=11.5-3
X=8.5

x+ 5(x+3)+ 2(x+3)+8=97
x+5x+15+2x+6+8=97
8x+29=97
8x=68
x=2/17

x+5(x+3)+2(x+3)+8=97
x+5x+15+2x+6+8=97
8x+15+6+8=97
8x=97-15-6-8
x=68/8 (/)是除的意思
x=8.5

方法一.
x + 5(x+3)+ 2(x+3)+8=97
x+7(x+3)+8=97
x+7x+21+8=97
8x+29=97
8x=97-29
8x=68
x=68/8
x=17/2

方法二.
x + 5(x+3)+ 2(x+3)+8=97
x+5x+15+2x+6+8=97
x+5x+2x+15+6+8=97
8x+29=97
8x=97-29
8x=68
x=68/8
x=17/2

x+ 5(x+3)+ 2(x+3)+8=97
x+5x+15+2x+6+8=97
8x+29=97
8x=97-29
x=8.5
咁都唔明ge話就無計!!好白架la

x+ 5(x+3)+ 2(x+3)+8=97
x+5x+15+2x+6+8=97
x+5x+2x=97-15-6-8
8x=68
x=8.5

x+ 5(x+3)+ 2(x+3)+8=97
=> x + 5x + 15 + 2x + 6 + 8 = 97
=> 8x + 29 = 97
=> 8x + 29 - 29 = 97 - 29 ..... 兩邊各減 29
=> 8x = 68
=> 8x / 8 = 68 / 8 ....... 兩邊各除以 8
=> x = 8.5