Реши уравнения 21000*х =84000 84000/ х =21000 х * 4 =84000 х / 21000 =4
21000х=84000 х=84000÷21000 х=4 $$$$$$$$ 84000÷х=21000 х=81000÷21000 х=4 $$$$$$$$$$ х×4=84000 х=84000÷4 х=21000 $$$$$$$$$$$ х÷21000=4 х=4×21000 х=84000