Ответы и объяснения

2014-04-10T18:18:20+00:00
7(×-2.5)=4 (3×+0.6) 7× - 17.5 = 12× + 2.4 - 17.5 - 2.4 = 7× + 12× 5× = 19.9 × = 19.9 : 5 × = 3.98