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Bài 19: Tìm a biết 1/ a + b – c = 18 với b = 100 ; c = -9 2/ 2a – 3b + c = 0 với b = -12 ; c = 4 3/ 3a – b – 2c = 2 với b = 6 ; c = -11 4/ 12 – a + b + 5c = -1 với b = -27 ; c = 5 5/ 1 – 2b + c – 3a = -9 với b = -23 ; c = -4
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