5/12*4+7=20/12+7=8ц 2/34/9*3+2/3=12/9+2/3=4/3+2/3=6/3=22/5+1ц 1/4*2=2/5+2ц 2/4=8/20+2ц 10/20=2ц 18/20=2ц 9/102ц 3/10*5+1/2=11ц 5/10+1/2=11ц 5/10+5/10=12
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5/12*4+7=20/12+7=8ц 2/3
4/9*3+2/3=12/9+2/3=4/3+2/3=6/3=2
2/5+1ц 1/4*2=2/5+2ц 2/4=8/20+2ц 10/20=2ц 18/20=2ц 9/10
2ц 3/10*5+1/2=11ц 5/10+1/2=11ц 5/10+5/10=12