Răspunsuri

2014-09-03T21:18:43+03:00
M₇ + M₇+7 +M₇+14+M₇+21 = 154

4M₇+42=154

4M₇=154-42

4M₇= 112

M₇= 28

M₇+7=28+7=35
M₇+14=28+14= 42
M₇+21=28+21=49