PROGRAM ex1_1
REAL :: a, b, av1, av2, av3
READ *, a, b
av1 = ( a + b ) / 2.0
av2 = ( a * b ) ** 0.5
av3 = 2.0 / ( 1.0 / a + 1.0 / b )
PRINT *, av1, av2, av3
END PROGRAM ex1_1
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