F.1 Maths (請列Step!!)

我f.3，

第一條你對了!!是-5
第一條既然你計到了，就不用我寫式啦~~

第二條，我計到是23/11，即是2.09(corr. to 2 decimal places)，
ABCD沒有一個，我想是出想題或者是你打錯了題目，我用計數機驗證過了
真的是23/11。
2nd Step:
4( 3-2h)-1= 3+ 3(h-5)
12 -8h -1 = 3 +3h -15 ←--展開(expand)了所有括號
12 -1 -3 +15 = 3h +8h ←----將未知數h和常數分開，簡單的調位
23 = 11h ←-----兩邊的計算結果
23/11 = h←把11除過去，只留下h
所以，h的值是23/11。

2007-01-15 18:01:52 補充：
brendayuen01128,你的第一題若要分兩個part計便要非常小心正負(因為正負括號對正負有影響)( -3) (-4) – ( 6)-( -8 )=[(-3) (-4)] - [( 6) (-8)]↑brendayuen01128由於要將4項分為一個正括號和負括號，所以要小心=(-3 -4) - (6 -8)= -7 -(-2)= -7 2= -5 ←final ans.你的第2題，我也不清楚你在做甚麼

( -3) + (-4) – (+6)-( -8 ) = ?
正負得負=(-3-4)
負負得正=(+6+8)
=(-3-4) –(+6+8)
=(-7)-(+14)
負正得負
=-7-14
=-21
=D


If 4( 3-2h)-1= 3+ 3(h-5) , h = ?
4(3-2h)-1/4 =6(h-5)/4
(3-2h)-0.25 =2.5(h-5)
(3-2h)-0.25+0.25 =2.5(h-5)+0.25
3h-2 =2.5(h-5)
3h-2 =2.5h- 8.75
3h-2+2 =2.5h-8.75+2
3h =2.5h-6.75
3h =2.5h-6.75-2.5h
3 h-2.5h =-6.75
2.5h =-6.75
h =-2 .6
h =D

( -3) + (-4) – (+6)-( -8 )

= -3-4-6+8

=-5

有冇抄錯題目?

4( 3-2h) -1= 3+ 3(h-5)
12-8h-1 = 3+3h-15
-8h-3h =-15-12+1-3
-11h =-29
h =2.636363636

都係個句,有冇抄錯題目?

( -3) + (-4) – (+6)-( -8 )
= -3 - 4 - 6 + 8
= -5

4( 3-2h)-1= 3+ 3(h-5)
12 - 8h - 1 = 3 + 3h - 15
-8h - 3h = 3 -15 - 12 +1
-11h = -23
h = 2.09..

兩條都唔岩 , 佢比個的選擇

1) ( -3) + (-4) – (+6)-( -8 )
= -3-4-6+8
= -5
係-5!!佢答案錯

4( 3-2h)-1= 3+ 3(h-5)
12-8h-1 = 3+3h-15
11-8h = 3h-12
23 = 11h
h=23/11
h=2.09
佢又錯@@?
邊個出架...........