✔ 最佳答案
1.
8 = 18-5c
8+5c = 18-5c+5c
8+5c = 18
8-8+5c = 18-8
5c=10
5c/5=10/5
c=2
2.
59-3d = 2
59-3d+3d = 2+3d
59 = 2+3d
59-2 = 2-2+3d
57 = 3d
57/3 = 3d/3
19 = d
3.
5=9+6-2x
5=15-2x
5+2x=15-2x+2x
5+2x=15
5-5+2x=15-5
2x=10
2x/2=10/2
x=5
4.
19-7b-5b=-53
19-12b=-53
19-12b+12b=-53+12b
19+53=-53+53+12b
72=12b
6=b
5.
3(2-z)=-9
6-3z=-9
6-3z+3z=-9+3z
6=-9+3z
6+9=-9+9+3z
15=3z
15/3=3z/3
5=z
6. (我估你o既"="應該係"+")
16=-8(5p+8)
16 = -40p-64
16+64 = -40p-64+64
80 = -40p
80/-40 = -40p/-40
-2=p
7. (我假設哩條式=0, 如果唔係你自己試下跟住計)
5(7+3q)+12 = 0
35+15q+12 = 0
15q+47 = 0
15q+47-47 = 0-47
15q = -47
q = -47/15
希望你學到點計,唔好淨抄答案