а-в=60
а:в=4
а=4в
4в-в=60
3в=60
в=60:3
в=20
а=4*20
а=80
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2) 80÷20=4
а-в=60
а:в=4
а=4в
4в-в=60
3в=60
в=60:3
в=20
а=4*20
а=80