438)
1)=6 8/11*4/5*5/4=6 8/11*1=6 8/11
2)=17/6*6/17*17.8=1*17.8=17.8
440)
1) 8 3/4-7 5/6=8 9/12-7 10/12=1-1/12=11/12
обратное 12/11
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438)
1)=6 8/11*4/5*5/4=6 8/11*1=6 8/11
2)=17/6*6/17*17.8=1*17.8=17.8
440)
1) 8 3/4-7 5/6=8 9/12-7 10/12=1-1/12=11/12
обратное 12/11