السؤال
الحل
3 − 1 1 2 ⋅ a b = 5 4
A _ − 1 = 1 ( 3 ) ( 2 ) − ( 1 ) ( − 1 ) 2 1 − 1 3 = 1 7 2 1 − 1 3 = 2 7 1 7 − 1 7 3 7 2 7 1 7 − 1 7 3 7 ⋅ 3 − 1 1 2 ⋅ a b = 2 7 1 7 − 1 7 3 7 ⋅ 5 4 1 0 0 1 ⋅ a b = 2 1
a = 2 b = 1
7432
7432=14−12=2A_−1=1(7)(2)−(3)(4)2−4−37=122−4−37=1−2−3272
25−5−13
25−5−13=(2)(−13)−(−5)(5)=−1A_−1=1−1−13−552=135−5−2
6−3−84
6−3−84=24−(24)=0
لا يوجد نظير ضربي.
5332⋅xy=40
|C_|=5332=10−9=1A_−1=112−3−35=2−3−352−3−35⋅5332⋅xy=2−3−35⋅401001⋅xy=8−12x=8y=−12
3−112⋅ab=54
A_−1=1(3)(2)−(1)(−1)21−13=1721−13=2717−17372717−1737⋅3−112⋅ab=2717−1737⋅541001⋅ab=21
a=2b=1
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