Ответы и объяснения

2012-09-10T16:14:19+00:00
2012-09-10T16:28:27+00:00

5.04:(104.2-х)=1.2

(104.2-х)=5.04:1.2

(104.2-х)=4.2

х=104.2-4.2

х=100

5.04:(104.2-100)=1,2