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 372,95 : 3 = 124.316666667

757,5 : 35 = 21.6428571429

 431,25:125 = 3.45

35,1 x 8,5 = 298.35

3,2 + 4,65 : 1,5 

=3,2+3,1

=6,3

347 + 418 + 123 + 12

=(347+123)+(418+12)

=470+430

=900

34 x 35 + 35 x 38 + 65 x 40 + 65 x 32

=35*(34+38)+65*(32+40)

=35*72+65*72

=72*(35+65)

=72*100

=7200

19 x 16 x 4 + 76 x 34

=76*16+76*34

=76*(16+34)

=76*50

=3800

136 x 68 + 16 x2 x 136 

=136*68+32*136

=136*(68+32)

=136*100

=13600

125 x 25 + 125 x 74 + 125

=125*(25+74+1)

=125*100

=12500

Tính bằng cách thuận tiện hả

3,2 + 4,65 : 1,5 = 3,2 + 3,1 = 6,3

347 + 418 + 123 + 12 = (347 + 123) + (418 + 12) = 470 + 430 = 900

34 x 35 + 35 x 38 + 65 x 40 + 65 x 32 = 35 x ( 34 + 38) + 65 x (40 + 32) = 35 x 72 + 65 x 72 = 72 x (35 + 65) = 72 x 100 = 7200

19 x 16 x 4 + 76 x 34

136 x 68 + 16 x2 x 136 

125 x 25 + 125 x 74 + 125

   35  x 20 x 5           8 x 9 x 125         25 x 7 x 4    72:(8x3)

= 35 x ( 20  x5 )      = ( 8x125) x 9    = (25x4)x7    = 72: 24

= 35 x 100              = 1 000 x 9       = 100x7        = 3

= 3 500                  = 9  000            =700

(36x7):4

=36: 4 x 7 

= 9 x7

= 63 

35 x 20 x 5 = 35\(\times\)(20 \(\times\)5)= 35 \(\times\)100=3500

8 \(\times\)9 \(\times\) 125 =(8\(\times\) 125)\(\times\)9=1000\(\times\)9=9000

25 \(\times\)7\(\times\)4=(25 \(\times\)4)\(\times\)7=100\(\times\)7=700

72 : (8\(\times\)3)=72 : 8 x 3 =(72:8) x 3=9 x   3=27

(36 x 7) : 4 =36 x 7 : 4 =7 x (36 :4)=7 x 9=63

\(46\cdot99\)

\(=46\cdot\left(100-1\right)\)

\(=46\cdot100-46\)

\(=4600-46\)

\(=4554\)

___________

\(34\cdot11\)

\(=34\cdot\left(10+1\right)\)

\(=34\cdot10+34\)

\(=340+34\)

\(=374\)

___________

\(25\cdot12\) 

\(=5\cdot5\cdot12\)

\(=5\cdot60\)

\(=300\)

__________

\(15\cdot4\)

\(=15\cdot2\cdot2\)

\(=30\cdot2\)

\(=60\)

____________

\(45\cdot6\)

\(=45\cdot2\cdot3\)

\(=90\cdot3\)

\(=2700\)

________

\(13\cdot99\)

\(=13\cdot\left(100-1\right)\)

\(=13\cdot100-13\)

\(=1300-13\)

\(=1287\)

______________

\(16\cdot19\)

\(=16\cdot\left(20-1\right)\)

\(=16\cdot20-16\)

\(=320-16\)

\(=304\)

_____________

\(35\cdot98\)

\(=35\cdot\left(100-2\right)\)

\(=35\cdot100-35\cdot2\)

\(=3500-70\)

\(=3430\)

____________

\(125\cdot16\)

\(=125\cdot8\cdot2\)

\(=1000\cdot2\)

\(=2000\)

___________

\(47\cdot101\)

\(=47\cdot\left(100+1\right)\)

\(=47\cdot100+47\)

\(=4700+47\)

\(=4747\)

46 x 99 =4554  , 34 x 11 = 374 , 25 x 12 =- 300 , 15 x 4 = 60 , 45 x 6 = 270 , 13 x 99 = 1287 , 16 x 19 = 304

35 x 98 = 3430 , 125 x 16  = 2000 ,  47 x 101  = 4747

3 x 125 x 8 + 4 x 24 x 35 + 4 x 35 x 2 x 12

= 375 x 8 + 96 x 35 + 140 x 24

= 3000 + 3360 + 3360

= 3000 + 3360 x 2

= 3000 + 6720

= 9720

ket qua 1055

đáp số:9720

a) 6857 + 3444 : 28

=6857 + 123

=6980

b) 80 - [ 130 - ( 75 - 11 ) ]

=80 - [ 130 - 64 ]

=80 - 66

=14

c) 100 : { 2 x [ 52 - ( 35 - 8 ) ]}

=100 : { 2 x [ 52 - 27 ]}

=100 : { 2 x 25 }

=100 : 50

=2

d) 12 : { 390 : [ 500 - ( 125 + 35 + 7 x 30 ) ] }

=12 : { 390 : [ 500 - ( 125 + 35 + 210 ) ] }

=12 : { 390 : [ 500 - 370 ] }

=12 : { 390 : 130 }

=12 : 3

=4

a) 6857 + 3444 : 28 = 6857 +  123 =6980

b) 80 - [ 130 - ( 75 - 11 ) ] = 80 - ( 130 - 64 ) = 80 - 66 = 14

c) 100 : { 2 x [ 52 - ( 35 -  8 ) ] = 100 : [ 2 x ( 52 - 27 ) ] = 100 : (  2 x 25 )= 100 : 50 = 2

d) 12 : { 390 : [ 500 - ( 125 + 35 + 7 x 30 ) ] } = 4

Cái này khi nãy tui đi học thêm gặp nhìu dạng như thế này đấy