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Ta có: A = 32 x 53 - 31 = 31 x 53 + 53 - 31 = 31 x 53 + 22
Do 22 < 32 => 31 x 53 + 22 < 53 x 31 + 32
=> 52 x 53 - 31 < 53 x 31 + 32
=> A < B
\(A=32\times53-31\)
\(\Leftrightarrow A=\left(31+1\right)\times53-31\)
\(\Leftrightarrow A=31\times53+53-31\)
\(\Leftrightarrow A=31\times53+22\)
Vì 22 < 32 nên 31 x 53 + 22 < 53 x 31 + 32 hay A < B
~ Hok tốt ~
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Ta có : A = 32 . 53 - 31 = (31 + 1) . 53 - 31 = 31 . 53 + 53 -31 = 53 . 31 +22
Vì 22 < 32 Nên : 53 . 31 + 22 < 53 . 21 +32
Hay : A < B
Vậy A < B .
Ta có: A = 32 . 53 - 31
A = ( 31 + 1 ) . 53 - 31
A = 31 . 53 + 53 - 31
A= 31 . 53 + 22
Vì 31 . 53 + 22 < 53 . 31 + 32 nên A < B
Vậy A < B
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a, A = 25 x 33 - 10 < B = 31 x 26 +10
b, A = 32 x 53 - 31 < B = 53 x 31 + 32
a)
Ta có : A = 25 x 33 - 10
A = 25 x ( 31 + 2 ) - 10
A = 25 x 31 + 25 x 2 - 10
A = 25 x 31 + 50 - 10
A = 25 x 31 + 40
và B = 31 x 26 + 10
B = 31 x ( 25 + 1 ) + 10
B = 31 x 25 + 31 x 1 + 10
B = 31 x 25 + 31 + 10
B = 31 x 25 + 41
Vì 40 < 41 nên A < B.
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a/ \(A=2018\cdot2018\)
\(=\left(2019-1\right)\cdot2018=2019\cdot2018-2018\)
\(B=2017\cdot2019\)
\(=\left(2018-1\right)\cdot2019=2018\cdot2019-2019\)
\(\Rightarrow A>B\)
b/
\(A=2018\cdot2019\)
\(=\left(2017+1\right)\cdot2019=2017\cdot2019+2019\)
\(B=2017\cdot2020\)
\(=2017\cdot\left(2019+1\right)=2017\cdot2019+2017\)
\(\Rightarrow A>B\)
32 . 53 - 31 = 53.(31 + 1) - 31 = 53.31 < 53.31 + 32
vt < vp nha