Odpowiedzi

2010-03-14T16:43:11+01:00
*5

(-20a+15)-5*[(2a+3)*(-3)]
(-20a+15)-5*[-6a-9]
(-20a+15)+30a+45
-20a+15+30a+45
10a+60
2010-03-14T16:50:01+01:00
-20a+15
________ -(2a+3)(-3) = -20a+15
5 _______ + (6a+9) /*5 =
5

-20a+15 +30a +45 =


10a+60
10a= (-60) /÷10
a = (-6)