(725 * x- 92) : 36= 78
725*х-92=78*36
725*х-92=2808
725*х=2808+92
725*х=2900
х=2900:725
х=4
(912-54950: y) + 483 = 610
912-54950:у=610-483
912-54950:у=127
54950:у=912-128
54950:у=785
у=54950:785
у=70
1/а - 2/b = (b-2a)/ab
4/c+3/2c = 8/2c + 3/2c= 11/2c
1) 1.4 - 0,5 = 0.9
2) 0.9+ 1.4= 2.3
3) 4.1 - 2.3 = 1.8
ответ 1.8 кг