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8/14 = 4/4+a
32+8a = 56
8a = 56-32
8a = 24
a = 3
3.
50+a = 180
a = 180-50
a = 130°
95+b = 180
b = 180-95
b = 85°
80+c = 180
c = 180-80
c = 100°
110+d = 180
d = 180-110
d = 70°
4.
K = 18×2 = 36 m
5.
L ruangan = 450×300 = 135000
L ubin = 30×30 = 900cm
135000:900= 150 ubin