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-------------------- = 73,4
36+34
2520 + 34x
---------------- = 73,4
70
2520 + 34x = 73,4 x 70
2520 + 34x = 5138
34x = 5138 - 2520
34x = 2618
x = 2618/34
x = 77
jadi, nilai rata-rata fisika kelas IX B adalah 77
semoga membantu ^-^