(-12)×2/3-6×(-22/7)+1/3×(-12)+20×(-22/7)要用简便算法喔.

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(-12)×2/3-6×(-22/7)+1/3×(-12)+20×(-22/7)要用简便算法喔.

(-12)×2/3-6×(-22/7)+1/3×(-12)+20×(-22/7)要用简便算法喔.
(-12)×2/3-6×(-22/7)+1/3×(-12)+20×(-22/7)
要用简便算法喔.

(-12)×2/3-6×(-22/7)+1/3×(-12)+20×(-22/7)要用简便算法喔.
(-12)×2/3-6×(-22/7)+1/3×(-12)+20×(-22/7)
=(-12)×2/3-6×(-22/7)+2/3×(-6)+20×(-22/7)
=2/3×(-12-6)+(-22/7)×(-6+20)
=2/3×(-18)+(-22/7)×14
=-12-44
=-56

=-12+(-22/7)*(20-6)
=-12+(-22/7)*14
=-12-44
=-56

(-12)×2/3-6×(-22/7)+1/3×(-12)+20×(-22/7)
=(-12)×(1/3+2/3)+1/3×(-12)+20×(-22/7)
=(-12)×(2/3+1/3)-22/7×(20-6)
=-12-44
=-56