1) 0.3 - (a - 2) = 0.3 - a + 2 = 2.3 - a = 2.3 - 0.7 = 1.6
2) 3 - (4 + b) = 3 - 4 - b = -1 - b = -1 - 5 = -6
3) 2.5 + (c - 1) = 2.5 + c - 1 = 1.5 + c = 1.5 + 0.4 = 1.9
4) 10 - (8.7 - d) = 10 - 8.7 + d = 1.3 + 9.3 = 10.6
5) 6.3 - (7 - b) = 6.3 - 7 + b = 13.3 + 0.8 = 14.1
1)17/26-4/13=9/26
2)17/26+9/26=26/26
26/26=1
ответ: 1
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345000-206000=139000 в третьем
219000-139000=80000 во втором
206000-80000=126000 в первом