Упростите выражения и найдите его значение:
1) -20a + 40 +18a, при a = 50;
2) 9,4b - 13 - 10b, при b = 15;
3) -14 1/7с + 18 2/7 -12 , при с = -1,4;
4) 9x - 10y + 16x + 9y, при х = -0,8, y = 2,5;
5) -1,4a + 31b -2,6a +4b, при a = 1,4, b = 0,2.
Дам 40 баллов срочно
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