A)d÷30=200-80 б)140-x=630÷7 в)6×c=420+120 г)320÷a=72÷36

d÷30=200-80 d : 30 = 120 d = 120 * 30 d = 3 600 ___________ 3 600 : 30 = 200 - 80   140-x=630÷7 140 - х = 90 х = 140 - 90 х = 50 __________ 140 - 50 = 630 : 7 6×c=420+120 6×c = 540 с = 540 : 6 с = 90 __________ 6 * 90 = 420 + 120 320÷a=72÷36 320÷a = 2 а = 320 : 2 а = 160 __________ 320 : 160 = 72 : 36