1: Tính
a) B = 2016 x 2016 - 2014 x 2018
b) 327 x 412 + 400 / 328 x 412 -12
c) ( 1234 x 567 - 667 ) : ( 567 + 1234 x 5
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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
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
c ko tìm đc
\(\frac{1234\times567-667}{567+1234\times566}=\frac{1234\times\left(566+1\right)-667}{567+1234\times566}=\frac{1234\times566+1234-667}{567+1234\times566}\)
\(=\frac{1234\times566+567}{567+1234\times566}=1\)
\(=15.\left(\frac{21.10101}{43.10101}-\frac{33.10101}{35.10101}\right)\)
\(=15.\left(\frac{21}{43}-\frac{33}{35}\right)\)
\(=15.\frac{-684}{1505}=\frac{-2052}{301}\)
1 a/ B = 2016 . 2016 - 2014 . 2018
=\(2016^2-\left(2016-2\right).\left(2016+2\right)\)
= \(2016^2-2016.\left(-2+2\right)\\\)
=\(2016^2-2016.0 \)
= \(2016^2\)
1: Tính
a) B = 2016 x 2016 - 2014 x 2018
= (2016 x 2016) - (2014 x 2018)
= 4064256 - 4064252
= 4
b) 327 x 412 + 400 / 328 x 412 -12
= (327 x 412 + 400) / ( 328 x 412 - 12)
= 135124 / 135124
= 1
c) ( 1234 x 567 - 667 ) : ( 567 + 1234 x 5)
= (1234 x 567 - 667) : (567 + 1234 x 566)
= [1234 x 566 + (1234 - 667)] / (1234 x 566 + 567)
= (1234 x 566 + 567) / (1234 x 566 + 567)
= 1
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