1. Найдите значение буквенного выражения:
a) 16 - а, при а = 2,4
b) 0,2b + 1,6 при b = 4,5
c) 5 - х2 при х = 0,7
2. Решите уравнение:
a) 6x = 72
b) 7 + 4x = 12
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