реши уравнение с×3=210,с×3=240, 210÷а=30, 240÷а=30, х÷3=70,х÷3=60

с×3=210с=210:3с=7070×3=210

C•3=210C=210:3C= 70C•3=240C= 80210:a=30A= 210:30A= 7240:a=30A= 240:30A=8X:3=70X=70•3X=210X:3=60X= 3•60X= 180