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4 / 5 - (1 / 4 + 3 / 8)
seven-fortieths
4/5-（2/8+3/8）=4/5-5/8=32/40-25/40=7/40
(1) , 8-3 and 1 / 2 = () fraction - 3 and 1 / 2 = () (2), 3 / 4-5 / 4
(1) , 8-3 and 1 / 2 = () fraction - 3 and 1 / 2 = ()
(2) 3-5 / 4-3 / 2 = () / 60 + () / 60 - () / 60
(3) , 5 = () / 1 = 3 and () / 6 = 2 / 1 and 7 + () = 4 and 2 / 3-1 and 1 / 4 + ()
(4) , 1 / 2, (), 1 / 8, 1 / 16, (), ()
Judge the parity f (x) = 2x4 power + 3x square
f(x)=2x^4+3x^2
f(-x)=2(-x)^4+3(-x)^2
=2x^4+3x^2
=f(x)
So it's an even function
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