7. Вычислите наиболее удобным способом,
a) 77 - 59 + 28 - 41 + 72 - 77;
б) 88 - 74 + 37 - 26 + 63 - 88;
B) 54 - 100 + 60 + 40 - 2,5 - (-54) + 2 + 0,5;
г) 37 - (+26) - 35 + 37 - 34 + (-24).​
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