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\(\frac{54\times107-53}{53\times107+54}=\frac{53\times107+107-53}{53\times107+54}=\frac{53\times107+54}{53\times107+54}=1\)
\(\frac{135\times269-134}{134\times269+135}=\frac{134\times269+269-134}{134\times269+135}=\frac{134\times269+135}{134\times269+135}=1\)
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THAM KHẢO :
A = 53.107 + 54 53 + 1 .107 − 53
= 53.107 + 54 53.107 + 107 − 53
= 53.107 + 54 53.107 + 54 = 1.
B = 134.269 + 135 134 + 1 .269 − 133
= 134.269 + 135 134.269 + 269 − 133
= 134.269 + 135 134.269 + 136 > 1
⇒A < B
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54.(53-81)+53.(81-54)
=(54-54)+(53-53).(21-81)
=0+0.0
=0
Tick mk du 100 nha.
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54.(53-81)+ 53.(81-54)
= 54.(53-81 + 81-54)
= 54.(53-54)
=54.(-1)
=-54
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\(3)1579-(53+1579)-(53) \)
\(=1579-53-1579+53\)
\(=(1579-1579)-(-53+53)\)
\(=0-0\)
\(=0\)
\(4)2001-15+54-2001-54\)
\(=(2001-2001)+(54-54)-15\)
\(=0+0-15\)
\(=0-15\)
\(=-15\)
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27 : 22 = 25 = 32
54 : 53 = 5
24 - 3.25 = 16 - 96 = - 80