數學..................方程式(超急)

1.12+X=56 => X = 56-12 = 44
2.X-17=3 => X = 3+17 = 20
3.5X=35 => X = 35/5 = 7
4.9份之X=31 => X = 31 * 9 = 279
(1-4題要式,要笞案)
5.X+1.25=6.4 => X = 7.65
6.3.2x=25.6 => x = 8
7.x-4份之3=1又4份之1 => x = 2
8.7份之2x=25.6 => x = 12.8 * 7 = 89.6
9.10份之3+x=2又15份之2 => x = 1又6份之5
10.3份之x=1.32 => x= 3.96
11.Hx30%=15 => H = 50
12.6+x=16.2 => x = 10.2
13.5份之4x=36 => x = 45
14.x-1又5份之2=10份之5 => x=1又10份之9
15.13.7+x=28.59 => x = 14.89
16.Hx75%=90 => H=120
17.5.27份之x=10 => x =52.7
18.1.2x=30Hx110%=55 => H= 1又3份之2 , x= 45又6份之5
19.Hx110%=55 => H=50
20.x+12份之5=48份之47 => x=48份之27 = 16份之9
(5-20題要笞案)

1.12 X=56
X=56-12=44

2.X-17=3
X=17 3=20

3.5X=35
X=35/5=7

4.9份之X=31
X=31x9=279

5.X 1.25=6.4
X=6.4-1.25=5.15

6.3.2X=25.6
X=25.6/3.2=8

7.X-4份之3=1又4份之1
X=1又4份之1 4份之3=2

8.7份之2X=25.6
X=25.6x2份之7=89.6

9.10份之3 X=2又15份之2
X=2又15份之2-10份之3=1又6份之5

10.3份之X=1.32
X=1.32x3=3.96

11.Hx30%=15
H=15x30份之100=50

12.6 X=16.2
X=16.2-6=10.2

13.5份之4X=36
X=36/4份之5=45

14.X-1又5份之2=10份之5
X=10份之5 1又5份之2=10份之19=1.9

15.13.7 X=28.59
X=28.59-13.7=14.89

16.Hx75%=90
H=90x75份之100=120

17.5.27份之X=10
X=10x5.27=52.7

18.1.2X=30Hx110%=55
X=55x12份之10=45又6份之5
H=55x110份之100x30份之1=1又3份之2

19.Hx110%=55
H=55x110份之100=50

20.X 12份之5=48份之47
X=48份之47 -12份之5=16份之9