1) 93 * 24 - 27 * 24 + 66 * 76 = 24 * (93 - 27) + 66 * 76 = 24 * 66 + 66 * 76 = 66 * (24 + 76) = 66 * 100 = 6600
2) 82 * 46 + 82 * 54 + 135 * 18 - 18 * 35 = 82 * (46 + 54) + 18 * (135 - 35) = 82 * 100 + 18 * 100 = 100 * (82 + 18) = 100 * 100 = 10000
400-x=170. .
x=400-170
x=230
400-230=170
400-x=270
x=400-270
x=130
400-130=270
x-80=90*7
x-80=630
x=630-80
x=550
550-80=90*7
x-80=90*5
x-80=450
x=370
370-80=90*5
x:6=56+44
x:6=100
x=100*6
x=600
600:6=56+44
x:6=156+44
x:6=200
x=200*6
x=1200
1200:6=156+44
Х * 16 = 25
Х = 25/16
Х = 1 ( 9/16 )
2)
540 • х = 650
Х = 650 : 540
Х = 1 ( 110/540 )
Х = 1 ( 11/54 )
21=3,7.
90=3,10,15,18,30.
2=10,18,30,84.
5=10,15,30.
Если не ошибаюсь.