Tính nhanh

A.58×75+58×50-58×25

B.48×19+48×115+134×52

C. 27×39+27×63-2×27

D. 35×23+35×41+64×65

E. 27×18+27×83-27×1

F. 19×27+47×81+19×20

G.23×41-104×77+23×63.

🐾 `color{red}\text{Cornnguyen}`🐾

`A `

`58×75+58×50-58×25`

`= 58× ( 75 + 50 - 25 )`

`= 58 × 100`

______________________________

`B` 

`48×19+48×115+134×52`

`= 48 × (19 + 115) + 134 × 52`

`= 48 × 134 + 134 × 52`

`= 134 × ( 48 + 52 )`

`= 134 × 100`

`= 13400`

______________________________

`C. `

`27×39+27×63-2×27`

`=27×(39+63-2)`
`=27×100`

`=2700`

______________________________

`D. `

`35×23+35×41+64 ×65`

`= 35× ( 23 + 41 ) + 64` × `65`

`= 35× 64 + 64 x 65 `

`= 64` x `( 35 + 65 )`

`=  64` x `100`

`= 6400`

_________________________________

`E `

`27×18+27×83-27×1`

`= 27× ( 18 + 83 - 1)`

`= 27× 100`

`= 2700`

_________________________________

`F `

`19×27+47×81+19×20`

`= 19× ( 27 + 20 ) + 47 × 81` 

`= 19× 47 + 47 × 81`

`= 47 × ( 19 + 81 )`

`= 47 × 100`

`= 4700`

_________________________________

`G` 

`23×41-104×77+23×63`. 

`= 943 - 8008 + 1449`

`= -5616`

Đáp án:

A.58×75+58×50-58×25

=58x(75+50-25)

=58x100=5800

B.48×19+48×115+134×52

=48x(19+115)+134x52

=48x134+134x52

=134(48+52)

=134x100=13400

C. 27×39+27×63-2×27

=27(39+63-2)

=27x100=2700

D. 35×23+35×41+64×65

=35(23+41)+64x65

=35x64+64x65

=64(35+65)

=64x100

=6400

E. 27×18+27×83-27×1

=27(18+83-1)

=27x100=2700

F. 19×27+47×81+19×20

=19(27+20)+47x81

=19x47+47x81

=47(19+81)

=47x100=4700

G.23×41-104×77+23×63.

=23(41+63)-104x77

=23x104-104x77

=104(23-77)

=104x(-54)

=-5616