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G)5x7x77-7x60+49x25-15x42
=5x7x77-7x12x5+7x7x5x5-5x3x7x6
= 5x7(77-12+7x5-3x6)
=35(77-12+35-18)
= 35x82
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a)24.53+24.87+24.40
=24.(53+87+40)
=24.180
=4320
b)35.77-7.5.12+7.7.5.5+3.5.7.6
=35.77-35.12+35.35+35.18
=35.(77-12+35+18)
=35.118=4130
^^
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Ta có:
5 x 77 x 7 - 7 x 60 + 49 x 25 - 15 x 42
<=> 5 x 77 x 7 - 7 x 5 x 12 - 7 x 7 x 5 x 5 - 3 x 5 x 7 x 6
<=> 5 x 7(77 - 12 - 7 x 5 - 3 x 6)
<=> 35(77 -12 - 35 - 18)
<=> 35 x 15
<=> 525
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\(5.7.27-7.60+49.25-15.42=\left(5.7.27\right)-\left(7.60\right)+\left(49.25\right)-\left(15.42\right)=945-420+1225-630=525+595=1120\)
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5.77.7 - 7.60 + 49.25 - 15.42
= 5 . 7 . 11 . 7 - 7 . 60 + 7.7.25 - 15.6.7
= 7 . ( 35.11 - 60 + 7.25 - 15.6 )
= 7 . ( 385 - 60 + 175 - 90 )
= 7 . 410
= 2870
5 . 7.77 - 7.60 + 7.7.25 - 15.6.7
= 7.(5.77 - 60 + 7.25 - 15.6 )
= 7.(5.77 - 12.5 + 35.5 - 5.18 )
= 7.[5.(77 - 12 + 35 - 18)]
= 7.5.82
= 7.410
= 2870
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a, 53 x 39 + 47 x 39 ‐ 53 x 21 ‐ 47 x 21
= 53 x ﴾39‐21﴿ + 47 x ﴾93‐21﴿
=53 x 18 + 47 x 18
= ﴾53 +47﴿ x 18
=100 x 18
=1800
b,2 x 53 x 12 + 4 x 6 x 87 ‐ 3 x 8 x 40
=24 x 53 + 24 x 87 ‐ 24 x 40
=24 x ﴾53+87‐40﴿
=24 x 100
=2400
c,5 x 7 x 77 ‐ 7 x 60 +49 x 25 ‐15 x 42.
=5 x 7 x 77 ‐ 7 x 5 x 12 +49 x 5 x 5 ‐ 5 x 3 x 42.
=5 x 539 ‐ 84 x 5 +245 x 5 ‐5 x 126
=5 x ﴾539 ‐ 84 +245 ‐126﴿
=5 x 574
=2870
\(53.39+47.39-53.21-47.21\)
\(=39\left(53+47\right)-21\left(53+47\right)\)
\(=39.100-21.100=100\left(39-21\right)\)
\(=100.18=1800\)
\(2.53.12+4.6.87-3.8.40\)
\(=24.53+24.87-24.40\)
\(=24\left(53+87-40\right)=24.100=2400\)
\(5.7.77-7.60+49.25-15.42\)
\(=7.385-7.60+7.175-7.90\)
\(=7\left(385-60+175-90\right)=7.410=2870\)
5*77*7-7*60+49*25*15*42=774025
tính nhanh bn ơi đừng viết kết quả ko