12×5×56×5=(12+56)×5.
錯誤
錯誤
分析:12×5×56×5按照從左到右的順序計算計算出結(jié)果;(12+56)×5先算小括號里面的加法,再算括號外的乘法的運(yùn)算順序計算出結(jié)果,然后比較即可.
解答:解:12×5×56×5,
=60×56×5,
=3360×5,
=16800;
(12+56)×5,
=68×5,
=340.
16800≠340;
故答案為:錯誤.
點評:解決本題要注意運(yùn)算順序,不能錯用運(yùn)算定律.
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科目:小學(xué)數(shù)學(xué) 來源: 題型:

180÷60= 12×25= 0÷90=
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1.37-1.37÷1.37= 4.4÷(5×0.2)= 7×1.3=
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科目:小學(xué)數(shù)學(xué) 來源: 題型:解答題

180÷60=12×25=0÷90=
4×5÷4×5=0.25×4+4=131+218+269+182=
25×6×4=420÷35=36×5×4=
120÷5÷3=198-75-25=120-20÷5=
59億-58億=(1.3+3.5)÷0.6=75÷2.5=
0.45÷1.25÷8=2.5×7.6×4=97.6÷0.02=
8.8-(0.25+0.4)=0.25+87+0.75=0.8-0.35×2=
0.1÷0.01×0.1=9.9+9.9×99=2.7×3.6+6.4×2.7=
720÷8÷9=2.9+5.7+2.1=2-0.16-0.64=
16.7+84.5-16.7=6.8-(3.8+2.9)=9×1.3+9×6.7=
5.5-5.25+5.2=0.8×25-10=42.8×25×4=
7.2+2.8=0.9÷0.01=3.5+7.6=
3×0.2×0.5=0.96÷0.3=1.5×0.4=
7÷0.25=2.5×0.7×0.8=8-2.5=
16÷1.6=5.6×1.01=8×(2.5+0.25)=
0.36+0.64=64.32÷16=72.8÷0.8=
8.4×0.2+1.6×0.2=8.4÷4.2=0.05×0.8=
2.56-0.37=1.23×3=25×0.8×0.5=
12×2.5=3.2÷1.6=3.5+3.5×3=
19.6÷2=8.8÷2.2=3.9+2.03=
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0.75×4=(1.5+0.25)×4=4.2÷0.1=
4.2÷3.5=2.14-0.9=27+456+73=
12÷0.3=2.87÷0.7=13÷4=
24÷4+56÷4=2.1×0.3÷2.1=2.3-0÷8.1=
1.37-1.37÷1.37=4.4÷(5×0.2)=7×1.3=
0.96÷0.06=0.36×0.3=0.35÷0.7=
13.65÷13=4×0.8×0.25×1.25=13+0.7÷0.7=
7.05×23.7+7.05×76.3=0.125×3.2×2.5=(12+23.1÷0.75)×0.4-5.12=
728+199=637-201=16×25=
1.6×[(12-7.2)÷(0.84÷2.1)]=

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0.22×102=9.6÷0.8=5×0.24=4.5-0.05=
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0.61+0.39=0.56÷28=10÷20=4.08÷0.4=
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2.3×100=0.75×100=0.108÷2=10.8÷9=
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84÷0.21=0.75÷0.25=2.5×16=0.108÷2=
1.75+32.5=16-5.07=5.2÷13=1.64÷41=
1.02×0.2=0.26×0.3=8.4×0.02=1.29×6=
0.8×0.05=12.6÷0.03=8.71÷0.1=21÷0.21=
0.8×0.13=0.34÷17=8.08÷0.4=0.5×2.2=
1.24÷4=3.27+0.63=5.02×0.3=0.3×0.5=
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0.54+2.2=3.5-0.05=2÷0.02=0.25×40=
1.5×0.6=0.32÷0.8=12.25÷0.5=73.5×0.1=
46.5+52.5=0.45×102=1.25×88=2.64+3.85+1.54=
8×1.25=5.6÷3.5=4.2÷0.7÷6=0.4×8.6×25=
0.27÷0.3=2.5×101=0.65×101-0.65=2.6×7÷2.6×7=

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