(45+825) : (51:17) =290
1. 45 + 825 = 870
2. 51:17=3
3.870:3=290
(11×123) ×21=28413
1. 11×123=1353
2. 1353×21=28413
52988:(37+29)=
1. 37+29=66
2.52988:66= 802,8484848485
5(4х-y)-3(y+2х)=(20x-5y)(-3y-6x)
1) 70-х=52
х=70-52
х=18
2) х-68=29
х=68+29
х=97
3)41+х=.104
х=104-41
х=63
4) х+41=68
х=68-41
х=27