17 а) 36/299-121=36/171
б) 235/2660
в) 2080/3640
г)4200/960=4,375
18 а)х^2-255
б)-8а^2-1
в) b^2+9
г)75х^2+16
д)х^2+1
е)5х^2+0.25
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17 а) 36/299-121=36/171
б) 235/2660
в) 2080/3640
г)4200/960=4,375
18 а)х^2-255
б)-8а^2-1
в) b^2+9
г)75х^2+16
д)х^2+1
е)5х^2+0.25