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Найти значение выражения рациональным способом:

1) -40 + (-30) + (-20) + (-10) + 0 + 10 + 20 + 30 + 40;

2) –10 + (-8) + (-6) + (-4) + (-2) + 0 + 2 + 4 + 6 + 8 + 10;

3) -20 + (-19) + (-18) + ... + 18 + 19 + 20 + 21;

4) -10 + (-9) + (-8) + ... + 7 + 8 + 9.​
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