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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