a)−43×92−46×27+46×41=−46×92+3×92−46×27+46×41=−46(92+27−41)+276=−46×160+276=−7360+276=−7094b)-72.(15-49)+15.(-56+72)
= -72.15 + 49.72 - 56.15 + 15.72
= ( -72.15 + 72.15 ) + ( 49.72 - 56.15 )
= 0 + 2688
= 2688
c)(-2^4).17.(-3)^0.(-5)^6.(-1^2n)
=(-2^4).17.1 (-5)^6.(-1)
=(-2^4).17.(-5)^6
=-4250000