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-3b = - 3a --> b = a= 3
3c = b ---> c = 1/3b = 1
a+b+c = 3+3+1= 7
2) A^-1 =
|-4...-3|
|7.....5|
.
3) a+b+c+d = 2+13-3-1= 11
.
4)
|0..0..0|
|0..0...0|
.
5) (2x+1)(5) = 3(6x-1)
10x + 5 = 18x - 3
-8 x = - 8
x= 1
yg 5 agak lupa