решите уравнения исделайте проверку:400+f:80=600
500*x-600=400
1300-(b+800)=400
600*20-n=60
(600-500):y=20
d:(1300-800)=4

спасибо

1) 500х-600=400500х=400+600500х=1000х=1000:500х=2____________________Проверка:500*2-600=400

400+f:80=600                  500*Х-600=400        1300-(b+800)=400400+f=600*80                  500*Х=400+600       b+800=1300-400400+f=48000                   500*Х=1000             b+800=900f=48000-400                    Х=1000:500             b=900-800f=47600                           Х=2                        b=100Проверка                        Проверка                Проверка400+47600:80=600           500*2-600=400        1300-(100+800)=4001)400+47600=48000         1)500*2=1000          1)100+800=9002)48000:80=600                2)1000-600=400      2)1300-900=400600*20-n=60                    (600-500):у=20         d:(1300-800)=420-n=60:600                    100:у=20                  d:500=420-n=0,1                          у=100:20                 d=4*500n=20-0,1                          у=5                         d=2000n=19,9                             Проверка                ПроверкаПроверка                         (600-500):5=20        2000:(1300-800)=4600*20-19,9=60                 1)600-500=100        1)1300-800=5001)20-19,9=0,1                    2)100:5=20             2)2000:500=42)600*0,1=60