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Kelas 9 MatematikaBab Statistika
19 . 7,2 + a = 20 . 7,3
136,8 + a = 146
a = 146 - 136,8
a = 9,2
7,3 = (136,8+x):20
73 = 136,8+x
x = 136,8-73
x = 63,8