Tính nhanh :
1234x567-667
567+1234+566
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\(\frac{1234\times567-667}{567}+1234+566\)
\(=\frac{1234\times567-567-100}{567}+1234+566\)
\(=\frac{1234\times567}{567}-\frac{567}{567}-\frac{100}{567}+1234+566\)
\(=1234-1-\frac{100}{567}+1234+566\)
\(=1234\times2+564+\left(1-\frac{100}{567}\right)\)
\(=3032+\frac{467}{567}=3032\frac{467}{567}\)
\(\frac{1234\times567-667}{567+1234\times566}=\frac{1234\times\left(566+1\right)-667}{567+1234\times566}=\frac{1234\times566+1234-667}{567+1234\times566}\)
\(=\frac{1234\times566+567}{567+1234\times566}=1\)
a.\(\frac{327.412+400}{328.412-12}=\frac{327.412+400}{\left(327+1\right).412-12}=\frac{327.412+400}{327.412+412-12}=\frac{327.412+400}{327.412+400}=1\)
b.\(\frac{1234.567-667}{1234.566+567}=\frac{1234.\left(566+1\right)-667}{1234.566+567}=\frac{1234.566+1234-667}{1234.566+567}=\frac{1234.566+567}{1234.566+567}=1\)
A=36 x 350 + 1,2 x 20 x 3 + 9 x 4 x 4,5
= 12600 + 72 + 162
= 12834
=1234.(566+1)-677/567+1234.566
=1234.566+1234-667/567+1234.566
=1234.566+567/567+1234.566
=1
\(\frac{1234.567-667}{1234.566+567}=\frac{1234.\left(566+1\right)-667}{1234.566+567}=\frac{1234.566+1234-667}{1234.566+567}\) =\(\frac{1234.566+567}{1234.566+567}=1\)
A=126+72+163
A=397
B=1/6 x 1,25+0,25
B=1/6x5/4+1/4
B=5/24+1/4
B=11/24
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