问题标题:
①15-[1-(-20-4)]②22.54+(-4.4)+(-12.54)+4.4③(2/3-1/2)-(1/3-5/6)④(-6/13)+(-7/13)-(-2)⑤11+(-22)-3×(-11)要写出顺序,正确哟
问题描述:

①15-[1-(-20-4)]

②22.54+(-4.4)+(-12.54)+4.4

③(2/3-1/2)-(1/3-5/6)

④(-6/13)+(-7/13)-(-2)

⑤11+(-22)-3×(-11)

要写出顺序,正确哟

林奎回答:
  ①=15-1-20-4=15-(1+4)-20=-10   ②=22.54+(-4.4)+(-12.54)+4.4-12.54+12.54+4.4-4.4   =(22.54-12.54)+(-4.4+4.4)(-12.54+12.54)+(4.4-4.4)=10   ③=(2/3-3/6)-(2/6-5/6)=2/3-2/6-3/6+5/6=2/3+0=2/3   ④=-6/13-7/13+2=-1+2=1   ⑤=(-1)×(-11)+2×(-11)-3×(-11)=(-1+2-3)×(-11)=(-2)×(-11)=22
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