Ответ:
1) 5/6*9/15-5/12*4/15 = 1/2*3/3-1/3*1/3=1/2-1/9=7/18
2) 7/18*9/14+1/3*6/7=1/2*1/2+2/7=1/4+2/7=15/28
3) 9/20*2/3+5/14*7/25=3/10+1/2*1/5=3/10+1/10=2/5
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Ответ:
1) 5/6*9/15-5/12*4/15 = 1/2*3/3-1/3*1/3=1/2-1/9=7/18
2) 7/18*9/14+1/3*6/7=1/2*1/2+2/7=1/4+2/7=15/28
3) 9/20*2/3+5/14*7/25=3/10+1/2*1/5=3/10+1/10=2/5