Ответ:
3(0,4x+y)-4(3x-y)
3(0,4•5+3,9)-4(3•5-3,9)
3(2+3,9)-4(15-3,9)
3•5,9-4•11,1
17,7-44,4=-26,7
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Ответ:
3(0,4x+y)-4(3x-y)
3(0,4•5+3,9)-4(3•5-3,9)
3(2+3,9)-4(15-3,9)
3•5,9-4•11,1
17,7-44,4=-26,7