x + y = 99
y = 99 - x
x - y = 33
x -99 + x = 33
2x = 132
x = 66
y = 99-66
y = 33
xy = 66×33
xy =2178
jadi hasil kali dia bilangan adalah 2178
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x + y = 99
y = 99 - x
x - y = 33
x -99 + x = 33
2x = 132
x = 66
x + y = 99
y = 99-66
y = 33
xy = 66×33
xy =2178
jadi hasil kali dia bilangan adalah 2178