Oblicz najprostszym sposobem.
a) 12 x (-3) - (-4) x 12
b)248*(-3)-48(-3)
c)(-36) : (-7)+15 : (-7)
d)(-19) : (-2)+(-21) :2
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-36+48=12
-744+144=600
5,14+2,14=7,28
9-10,5=-1,5