1)900*4000=3600000
2)3600000-3093468=506532
3)5207*96=499872
4)4571040/534=8560
5)499872+8560=508432
6)508432-506532=1900
620+у:2=260*22
у : 2 = 260*22 - 620
у:2 = 5100
у = 2550
1) (0.2х+0.4х)*3.5=6.3
0.2х+0.4х=6.3/3.5
0.6х=1.8
х=1.8/0.6
х=3
2) (0.7х-0.2х)*6.4=9.6
0.7х-0.2х=9.6/6.4
0.5х=1.5
х=1.5/0.5
х=3