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7,5 * (30 + b) - 225 = 90
225 + 7,5b - 225 = 90
7,5b = 90 | :7,5
b = 12
0.5(15+b+15)* 15- (15*15)=90
7,5(30+b)- 225=90
225+7,5b-225=90
7,5b= 90 |:7,5
b= 12
[ 7,5 bo 0,5 się skraca z 15]
prosze o najj, ;D
na pewno dpbrze, z panią robiliśmy dziś. (