1,2-0.78=8/15у-3/10у 0.42=16/30у-9/30у 0.42=7/30у У=0.42÷7/30 У=21/50×30/7 У=45/25=1ц4/5
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1,2-0.78=8/15у-3/10у 0.42=16/30у-9/30у 0.42=7/30у У=0.42÷7/30 У=21/50×30/7 У=45/25=1ц4/5