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2x10 2x2 3x8 3x5
-6 18 18 -21
20 4 dikurang 24 15
(-6)-18 18-(-21) -24 39
20-24 4-15 = -4 -11
2.det a x b
A= |-3 9| b= |6 -7|
|10 2| |8 5|
= axd - bxc = axd - bxc
= (-3)x2 - 9x10 = 6x5 - (-7)x8
= -6 - 90 = 30 - (-56)
= -96 = 86
(-96) x 86 = -8256