Question

Completati spatiile punctate va rooggg
Dau coronita.
1)18x-16x+...+5x=24x
2)16x-23x+...+6x=18x
3)10a+14a-...+12a=15a
4)11xy-7xy-...-8xy=21xy

Answer 1

a) 17x
b) 19x
c)21a
d) -25xy
a) 18x-16x+?+5x=24x
2x-?+5x=24x
?=24x-2x-5x
?=17x
b) 16x-23x+?+6x=18x
-7x+?+6x=18x
?=18x+7x-6x
?=19x
c) 10a+14a-?+12a=15a
24a-?+12a=15a
24a+12a-?=15a
36a-?=15a
?=36a-15a
?=21a
d) 11xy-7xy-?-8xy=21xy
4xy-?-8xy=21xy
4xy-8xy-21xy=?
?=-25xy