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37.24 + 37.76 + 63 . 79 + 21 . 63
= 37 . ( 24 + 76 ) + 63 . ( 79 + 21 )
= 37 . 100 + 63 . 100
= 3700 + 6300
= 10000
a) 37.24 + 37.76 + 63.79 + 21.63
= 37.(24 + 76) + 63.(79 + 21)
= 37.100 + 63. 100
= 100.(37 +63)
= 100.100
= 10000
b) 69.113 - 27.69 + 69.14 + 31
= 69.(113 - 27 + 14) +31
= 69.100 + 31
= 6931
c) 72.121 + 27.121 + 121
= 121.(72 + 27 + 1)
= 121.100
= 12100
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a) 17. 85 + 15 . 17 = 300
= 17. 9 85 = 15) + 300
= 2000
b) 72. 121 + 27 .121 = 121
= 121 . ( 72 + 27 = 1)
= 12100
c) 32. 39 + 52 . 21 - 12 . 39 + 21 . 48
= ( 32 - 12).39 + 21. ( 52 + 48)
= 2880
d) 47 - ( 45.24 - 52.12) : 14
= 47 - ( 45 . 16 - 25.12) : 14
= 17
e) 102 - 60 : ( 54 : 52 - 3. 5)
= 100 - 60 : ( 25 - 15)
= 100 - 6
= 94
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1) Tính nhanh
a) Ta có: \(5\cdot79\cdot4\cdot2\cdot25\)
\(=\left(5\cdot2\right)\cdot\left(4\cdot25\right)\cdot79\)
\(=79\cdot10\cdot100\)
\(=79000\)
b) Ta có: \(27\cdot121-87\cdot27+73\cdot34\)
\(=27\cdot\left(121-87\right)+73\cdot34\)
\(=27\cdot34+73\cdot34\)
\(=34\cdot\left(27+73\right)\)
\(=34\cdot100=3400\)
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a 58 x 75 + 58 x50 - 58 x25
= 58 x { 75 + 50 -25}
=58 x 100
=5800
27 x 121 - 87 x27 +73x34
=27 x { 121 - 87 } + 73 x 34
=27 x 34 + 73 x34
= 34x { 27 + 37}
=27 x100
=2700
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a) 48 . 19 + 48 . 115 + 134 . 52 b) 27 . 121 - 87 . 27 + 73 . 34 c) 29 . 38 - 29 . 23 + 64 . 71
= 48 . ( 19 + 15 ) + 134 . 52 = 27 . ( 121 - 87 ) + 73 . 34 = 29 . ( 38 - 23 ) + 64 . 71
= 48 . 134 + 134 . 52 = 27 . 34 + 73 . 34 = 29 . 15 + 64 . 71
= 134 . ( 48 +52 ) = 34 . ( 27 + 73 ) = 4979
= 134 . 100 = 34 . 100
= 13400 = 3400
Phần c) mình thấy hơi sai sai đề , bạn xem lại đề nhé
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a,48.(19+115)+134.52=48.134+134.52=134.(48+52)=134.100=13400
b,27.(121-87)+73.364=27.34+73.34=34.(73+27)=34.100=3400
c,125.(98-46)-52.25=125.52-52.25=25.(125-25)=25.100=2500
tick nha
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27 . 121 - 87 . 27 + 73 .54
= 27 . 121 - 87 . 27 + 73 . 2 . 27
= 27 . (121 - 87 + 73 . 2)
= 27 . 180
= 4860
\(27\cdot121-87\cdot27+73\cdot54\)
\(=27\cdot121-87\cdot27+146\cdot27\)
\(=27\left(121-87+146\right)\)
\(=27\cdot180\)
\(=4860\)
72.121+27.121+121
= 121 . ( 72 + 27 + 1)
= 121 . 100
= 12100
72.121+27.121+121
=121.(72+27+1)
=121.100
=12100