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b) (3/4)²×(8/9)²+(8/9)³:(1 1/3)³=(3/4*8/9)²+(8/9/1 1/3)³=(2/3)²+(8/9*3/4)³=4/9+(2/3)³=4/9+8/27=12/27+8/27= 20/27
c)(1 1/9)⁴×(0,9)⁴-(1,6)³:(4/5)³=(10/9*9/10)⁴-(1,6/0,8)³=1⁴-2³=1-8= -7