12 : {390 : [500 – (125 + 35.7)]}

= 12 : {390 : [500 – (125 + 245)]}

= 12 : {390 : [500 - 370]}

= 12 : {390 : 130}

= 12 : 3

= 4

a) \(27\cdot75+25\cdot27-150\)

\(=27\cdot\left(75+25\right)-150\)

\(=27\cdot100-150\)

\(=2700-150\)

\(=2550\)

b) \(12:\left\{390:\left|500-\left(125+35\cdot7\right)\right|\right\}\)

\(=12:\left\{390:\left|500-\left(125+245\right)\right|\right\}\)

\(=12:\left\{390:\left|500-370\right|\right\}\)

\(=12:\left\{390:130\right\}\)

\(=12:3\)

\(=3\)

a) 27.(75+25)-150=27.100-150=2550

a,3900.                     b,4

a) 27 . 75 + 25 . 27 - 150 = 2025 + 675 - 150 = 2700 - 150 = 2550.

Lưu ý. Có thể dùng tính chất phân phối của phép nhân đối với phép cộng để nhẩm:

27 . 75 + 25 . 27 - 150 = 27 . (75 + 25) - 150 = 27 . 100 - 150 = 2700 - 150 = 2550.

b) 12 : {390 : [500 - (125 + 35 . 7)]} = 12 : {390 : [500 - (125 + 245)]}

= 12 : [390 : (500 - 370)] = 12 : (390 : 130) = 12 : 3 = 4.

a,27+75.25+27-150

= 27.(75+25)-150

=27.100-150

=2700-150

=2550

b,12:{390:[500-(125+35.7)]}

=12:{390:[500-(125+245)]}

=12:{390:[500-370]}

=12:{390:130}

=12:3

=4

Thank you very much

a)\(27.75+25.27-150=27\left(75+25\right)-150\)

\(=27.100-150\)

\(=2700-150\)

\(=2550\)

b)\(12:\left\{390:\left[500-\left(125+35.7\right)\right]\right\}=12:\left\{390:\left[500-\left(125+245\right)\right]\right\}\)

\(=12:\left[390:\left(500-370\right)\right]\)

\(=12:\left(390:130\right)\)

\(=12:3\)

=4

a, 25.(75 + 27 - 150 )

= 25 . (-48)

= - 1200

b, 12 : { 390 : [500 - 370 ]

= 12 : { 390 : 130 }

= 12 : 3

= 4

a) \(27.75+25.27-150\)

\(=27.\left(75+25\right)-150\)

\(=27.100-150\)

\(=2700-150\)

\(=2550\)

b) \(12:\left\{390:\left[500-\left(125+35.7\right)\right]\right\}\)

\(=12:\left\{390:\left[500-370\right]\right\}\)

\(=12:\left\{390:130\right\}\)

\(=12:3\)

\(=4\)

a, 27.75+25.27-150=27.(75+25)-150

                               =27.100-150

                              =2700-150

                              =2550

b,12:{390:[500-(125+35.7)]}

=12:{390:[500-(125+245)]}

=12:{390:[500-370]}

=12:{390:130}

=12:3

=4.

12:{390:[500-125+35x7]}

=12:{390:620}

=12:39/62

=248/13

cám ơn nhé !

\(12:\left\{390:\left[500-\left(125+35\cdot7\right)\right]\right\}\)

\(=12:\left\{390:\left[500+370\right]\right\}\)

\(=12:\left\{390:870\right\}\)

\(=12:\frac{13}{29}\)

\(=\frac{348}{13}\)

b: I=-15+13=-2

các bạn ơi xin các bạn tội ngiệp cho tôi vài lik eSky Nguyễn

a).

= 27. (75+25)- 150

= 27. 100 -150

= 2700    - 150

= 2550

a, = 27 . ( 75 + 25 ) - 150 
    = 27 . 100 - 150
    = 2700 - 150
    = 2550
b, = 12 : { 390 : [ 500 - 370 ]
    = 12 : { 390 : 130 }
    = 12 : 3 
    = 4
 

a) 27.75+25.27-150=2025+675-150

                            =2700-150

                            =2550

b) 12:{390:[500-(125+35.7)]}=12:{390:[500-(125+245)]}

                                        =12:[390:(500-370)]

                                        =12:(390:130)

                                        =12:3

                                        =4

Thực hiện phép tính: 

a) 

27 . 75 + 25 . 27 - 150

= 27 . ( 75 + 25) - 150

= 27 . 100 - 150

= 2700 - 150

= 2550

b)

12: {390: [ 500  - ( 125 + 35 . 7 ) ] }

= 12 : { 390 : [ 500 - ( 125 + 245 ) ]  }

= 12 : { 390 : [ 500 - 370 ] }

=12 : { 390 : 130 }

= 12 : 3

= 4 

Ủng hộ nha! :)