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(5/12)² * (-12/5)² =[5/12 * (-12/5)]² =(-1)²=1
b) (1²₃ - ¾)² : 5 ½ =(1i 8/12 - 9/12)² : 11/2 =(20/12 - 9/12)²* 2/11 =
(11/12)²*2/11=121/144*2/11==11/72