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misal
bilang 1 = x
bilangan 2 = y
x - y = 5
x + y = 17
------------------ -
- 2y = - 12
y = 6
x + y = 17
x + 6 = 17
x = 17 - 6
x = 11
hasil kalinya = 11 x 6 = 66
4.
misal
bilangan 1 = x
bilangan 2 = y
x + y = 153
x - y = 39
----------------- -
2 y = 114
y = 57
x + y = 153
x + 57 = 153
x = 153 - 57
x = 96
ua kali bilangan terkecil dikurangi bilangan terbesar = 2 ( 57 ) - 96 = 18