12000×x=24000
х = 24000:12000
х = 2
12000×x=800×30
12000*х = 24000
х=2
80000:y=4000-2000
80000:у=6000
у=6000:80000
у=0,075
(500000-100000)÷b=80
50000:b=80
b=0,00016
12000×x=24000
х = 24000:12000
х = 2
12000×x=800×30
12000*х = 24000
х = 24000:12000
х=2
80000:y=4000-2000
80000:у=6000
у=6000:80000
у=0,075
(500000-100000)÷b=80
50000:b=80
b=0,00016