7 : 8 = х : 96
х = 7 * 96 : 8
х = 84
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у : 1 5/31 = 7 3/4 : 1/3
y = 1 5/31 * 7 3/4 : 1/3
y = 36/31 * 31/4 : 1/3
y = 9 : 1/3
y = 27
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2/5*3/8=3\20
5*2/11=10\11
15/16*8/9=5\6
4/5:2/15=4\5*15\2=6
<span>3/11:9=3\11*1\9=1\33</span>
См. в приложении.
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2.4/7.2=1.6/4.2
7.2/2.4=4.2/1.6
1.6/4.2=2.4/7.2
4.2/1.6=7.2/2.4
думаю так