(3/4-1/3):5/7 =(9/12-4/12)*7/5 = 5/12 * 7/5= 7/12
(1/4+2/3)*6/11= (3/12+8/12)*6/11 =11/12*6/11= 6/12=1/2
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(3/4-1/3):5/7 =(9/12-4/12)*7/5 = 5/12 * 7/5= 7/12
(1/4+2/3)*6/11= (3/12+8/12)*6/11 =11/12*6/11= 6/12=1/2