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-3x(-2) + (-3)x(-4)
6 + 12
18
b) 19-(-3)x[5-(+8)]
19+3x[5-(+8)]
22x[5-(+8)]
22x5 - 22x(+8)
110 - 178
-68
c) 12-[(13)-(-7)]:5
12x(-13) - 12x-(-7) :5
[-156 - 84 ]
[-240]:5
-48
d)10-(+20):[7+(-3)]
-10:[7+(-3)]
-0,7 + 0,3
-0,4
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