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a) -12·25·5·(-4)=-12·(-4)·25·5=48·125=6000
b) 5·(-⅜)·7·(-¹⁶/₉)·³/₃₅= 5·7·(-⅜)·(-¹⁶/₉)·³/₃₅=35· ·³/₃₅=35·=·= 2
c) 100·⁴/₇·0,36·(-⁴/₉)·⁷/₁₆=36·⁴/₇·(-⁴/₉)·⁷/₁₆=36·(-⁴/₉)·⁴/₇·⁷/₁₆=-16·=-4
d)¹/₅·²/₅·³/₅·⁴/₅·(-⁵/₅)·(-5)·(-5)·(-5)·(-⁵/₄)=¹/₅·²/₅··³/₅··⁴/₅··(-⁵/₅)·(-⁵/₄)=¹/₅·(-2)·(-3)·(-4)·(-⁵/₄)=¹/₅·(-⁵/₄)·(-24)=-·(-24)==6
e)(-27)·15·7·1·¹/₂₇·(-²/₁₅)·⁴/₇= (-27)·¹/₂₇·15·(-²/₁₅)·7·⁴/₇=-1·(-2)·4=8
f)(-13²⁵/₂₉)·17,27·0·(-329)= 0