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4. Calculati:
a)(49 – 52) · (49 – 62). (49 – 72) · (49 – 82);
b) (-27 +1³)•(-27+2³)•...•(-27+10³)
c)(-2)³+10•[1+1+2•(2•3-2)]
d) (-3)^198-4•{-2-2•[(-4)^8÷2¹⁴-2]}​