﹣13×2/3-0.34×2/7+1/3×﹙-13﹚-5/7×0.34
=﹣13×2/3+1/3×﹙-13﹚-0.34×2/7-5/7×0.34
=﹣13×﹙2/3+1/3﹚-0.34×﹙2/7+5/7﹚
=﹣13×1-0.34×1
=﹣13.34
负13乘以3分之2减0.34乘以7分之2加3分之1乘以(负13)减7分之5乘以0.34
=(-13)×2/3-0.34×2/7+1/3×(-13)-5/7×0.34
=(-13)×(2/3+1/3)-0.34×(2/7+5/7)
=-13-0.34
=-13.34
-13*2/3-0.34*2/7+1/3*(-13)-5/7*0.34)=-13*(2/3+1/3)-0.34*(2/7+5/7)=-13-0.34=-13.34