Răspunsuri

2014-11-13T09:29:46+02:00
Steluta inseamna inmultit!!! a)x+2x+3x+.......+10x=
(x+10x)*10:2=
11x*10:2=
110x:2=
55x
b)x-2x+3x+.....+9x-10x=
x-(2x+9x)*8:2-10x=
x-11x*8:2-10x=
x-88x:2-10x=
x-44x-10x=
43x-10x=
33x