7題簡易方程!!十萬火急(10點）

1. 9
2. 11
3. 7
4. 56
5. 9
6. 84
7. 108

1. 9b - 24 = 57
9b = 81
b=9

2.) 44 + 8f = 132
8f = 88
f = 11

3.) 85 - 6k = 43
85 = 43+6k
42 = 6k
k=7

4.) 4/p - 11 = 3
4/p = 14
4=14p
p=4/14
=2/7

5.) 7h - 25 =38
7h = 63
h = 9

6.) 12+ 7/m =24
7/m = 12
7=12m
m=7/12

7.) 54+ 9/r = 42
54r +9 = 42r
12r = -9
r= -9/12
=-3/4

一定要自己做多先會識架

1.) 9b - 24 = 57
9b=57+24=81
9b/9=81/9
b=9

2.) 44 + 8f = 132
8f+44-44=132-44
8f=88
8f/8=88/8
f=11

3.) 85 - 6k = 43
85-6k+6k=43+6k (為左方便以後的計算)
85=43+6k (左右對調)
6k+43=85
6k+43-43 = 85-43
6k=42
6k/6=42/6
k=7

4.) 4/p - 11 = 3
4/p-11+11=3+11
4/p=14
4/p x p= 14x p (令未知數p 從分母變分子)
4 = 14p
14p=4
14p/14 = 4/14
p=2/7

5.) 7h - 25 =38
7h-25+25=38+25
7h=63
7h/7=63/7
h= 9

6.) 12+ 7/m =24
12-12+7/m=24-12
7/m=12
7/m x m= 12x m
7=12m
12m=7
12m/12=7/12
m=7/12

7.) 54+ 9/r = 42
54-54+9/r=42-54
9/r= -12
9/r x r = -12x r
9= -12r
-12r = 9
-12r/-12 = 9/-12
r=-3/4

1.) b = 9 2.) f = 11 3.) k = 7
4.) p = 56 5.)h = 9 6.) m = 84
7.) r = -108

b = 9
f = 11
k = 7
p = 2/7
h = 9
m = 7/12
r = -3/4

1)9
2)11
3)7
4)0.286 (係p/4定4/p?，p/4既話答案係56)
5)9
6)0.583(係m/7既話，答案係84)
7)-0.75(係r/9既話，答案係-108)

1)9
2)11
3)7
4)56
5)9
6)84
7)108