(х-87)-27=36
х-87=36+27
х-87=63
х=63+87
х=150
-------------------------
(150-87)-27=36
1)15х-20
-8х+14
-12х-4
2)1,5х-6
-2,4+2,5х
-21-0,9х
3)4х+4
5,6-0,3х-1,2
-2х+0,3
1)+3,+6,+12,+24,+48,+96.
2)+4,+12,+36,+108,+324,+1296.
100 x 1,5 : 5 = 30
1) 100 x 1,5 = 150
2) 150 : 5 = 30