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b. 7/30 + 3/20 -4x4+1/4 = 7x2/30x2 + 3x3/20x3-17x15/4x15
=14/60+9/60-255/60 = -232/60=-58/15
c. 7x3+1/3 -6x8+7/8 =22x8/3x8-55x3/8x3 = 176-165/24 = 11/24
d. 4x6/9x6 + 11x3/18x3 +5x2/27x2 - (4x3+2)x18/3x18
=24/54+33/54+10/54-252/54 =(24+33+10-252)/54=67-252/54 =-185/54