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a) 6065 x 6 = 6 x 6065 = 36390
b) 2809 x 4 = 4 x 2809 = 11236
c) 2369 x 4 = 4 x 2369 = 9476
d) 1745 x 9 = 9 x 1745 = 15705
a) \(6065\times6\)
\(=2\times6065\times3\)
\(=12130\times3\)
\(=36390\)
b) \(2809\times4\)
\(=2\times2809\times2\)
\(=5618\times2\)
\(=11236\)
c) \(2369\times4\)
\(=1\times2\times2369\times2\)
\(=2\times2369\times2\)
\(=4738\times2\)
\(=9476.\)
d) \(1745\times9\)
\(=3\times1745\times3\)
\(=5235\times3\)
\(=15705\)
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a) 5 x 3 x 4 = (5 x 4) x 3
= 20 x 3
= 60
b) 6 x 5 x 7 = (6 x 5) x 7
= 30 x 7
= 210
c) 20 x 9 x 5 = (20 x 5) x 9
= 100 x 9
= 900
d) 2 x 7 x 50 = (2 x 50) x 7
= 100 x 7
= 700
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a) \(134\times4\times5\)
\(=134\times\left(4\times5\right)\)
\(=134\times20\)
\(=2680\)
b) \(5\times36\times2\)
\(=\left(5\times2\right)\times36\)
\(=10\times36\)
\(=360\)
c) \(42\times2\times7\times5\)
\(=42\times7\times\left(2\times5\right)\)
\(=42\times7\times10\)
\(=42\times(7\times10)\)
\(=42\times70\)
\(=2940\)
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a = 2002 x 2002 = (2000 + 2) x 2002 = 2000 x 2002 + 2 x 2002
b = 2000 x 2004 = 2000 x (2002 + 2) = 2000 x 2002 + 2 x 2000
Vì 2 x 2002 > 2 x 2000
Vậy a > b