a: \(60-26,75-13,25\)

\(=60-\left(26,75+13,25\right)\)

\(=60-40=20\)

b: \(38,25-18,25+21,64-11,64+9,93\)

\(=\left(38,25-18,25\right)+\left(21,64-11,64\right)+9,93\)

\(=20+10+9,93=39,93\)

c: \(45,28+52,17-15,28-12,17\)

\(=\left(45,28-15,28\right)+\left(52,17-12,17\right)\)

=30+40

=70

d: \(\left(72,69+18,47\right)-\left(8,47+22,69\right)\)

\(=72,69+18,47-8,47-22,69\)

\(=\left(72,69-22,69\right)+\left(18,47-8,47\right)\)

=50+10

=60

nhanh lên giúp mik.mik đang cần gấp

bạn kia đung rồi

Tính bằng cách thuận tiện: 

a) 15,27 - 4,18 - 2,09 = (15,27 - 4,18) - 2,09

                                  = 13,09 - 2,09

                                  = 11

b) 60 - 26,75 - 13,25 = 60 - (26,75 + 13,25)

                                  = 60 - 40

                                  = 20

c) [72,69 + 18,47] - [8,47 + 22,69] = 72,69 + 18,47 - 8,47 - 22,69

                                                      = (72,69 - 22,69) + (18,47 - 8,47)

                                                      = 50 + 10

Chúc học tốt!

(72,69+18,47)-(8,47+22,69)=(72,69-22,69)+(18,47-8,47)

                                            =             50     +10 

                                            =60

(72,69+18,47) - ( 8,47 + 22,69)

= ( 72,69 - 22,69) + ( 18,47 - 8, 47 )

= 50 +10

=60

( 72,69 + 18,47 ) - ( 8,47 + 22.69 )

= 72,69 + 18.47 - 8,47 -22,69

=( 72,69 - 22,69 ) + ( 18,47 - 8,47 )

=50 + 10

=60

Cac ban lam cho minh ti

a)15,27-4,18-2,09

=15,27-(4,18+2,09)

=15,27-6,27

=9

b)60-26,75-13,25

=60-(26,75+13,25)

=60-40

=20

c)38,25-18,25+21,64-11,64+9,93

=(38,25-18,25)+(21,64-11,64)+9,93

=20+10+9,93

=39,93

d)45+52,17-15,28-12,17

=45+(52,17-12,17)-15,28

=45+40-15,28

=69,72

e)(72,69+18,47)-(8,47+22,69)

=72,69+18,47-8,48-22,69

=(72,69-22,69)+(18,47-8,47)

=50+10

=60

bạn hữu đức làm sai ý e

A, 15,27 - 4,18 - 2,09  = 15,27 - ( 4,18 + 2,09 )

                                 = 15,27 - 6,27

                                 = 9

B, 
60-26,75-13,25=60-(26,75+13,25)=60-40=20

C,38,25-18,25+21,64-11,64+9,93=20+10+9,93=39,93

e,(72,69+18,47)-(8,47+22,69)=72,69+18,47-8,47-22,69=72,69-22,69+18,47-8,47=50+10=60

a, 15,27-4,18-2,09                      

=15,27-(4,18+2,09)

=15,27-6,27

=9

a) \(15,27-4,18-2,09\)

\(=11,09-2,09\)

\(=9\)

b) \(60-26,75-13,25\)

\(=60-\left(26,75+13,25\right)\)

\(=60-40\)

\(=20\)

c) \(38,25-18,25+21,64-11,64+9,93\)

\(=\left(38,25-18,25\right)+\left(21,64-11,64\right)+9,93\)

\(=20+10+9,93\)

\(=30+9,93\)

\(=39,93\)

e) \(\left(72,69+18,47\right)-\left(8,47+22,69\right)\)

\(=72,69+18,47-8,47-22,69\)

\(=\left(72,69-22,69\right)+\left(18,47-8,47\right)\)

\(=50+10\)

\(=60\)

Chiều dài của hình chữ nhật là:

\(36\div\dfrac{3}{5}=60\left(cm\right)\)

Sợi dây thép đso dài số mét là:

\(\left(60+36\right)\times2=192\left(cm\right)\)

Đổi: \(192cm=1,92m\)

Đáp số: \(1,92m\)

\(\text{∘ Ans}\)

\(\downarrow\)

`1,`

`a)`

`15,27 - 4,18 - 2,09`

`= (15,27 - 2,09) - 4,18`

`= 13,18 - 4,18`

`= 9`

`b)`

`60 - 26,75 - 13,25`

`= 60 - (26,75 + 13,25)`

`= 60 - 40 = 20`

`c)`

`38,25 - 18,25 + 21,64 - 11,64 + 9,93`

`= (38,25 - 18,25) + (21,64 - 11,64) + 9,93`

`= 20 + 10 + 9,93`

`= 30 - 9,93`

`=``20,07`

`e)`

`(72,69 + 18,47 ) - (8,47 + 22,69)`

`= 72,69 + 18,47 - 8,47 - 22,69`

`= (72,69 - 22,69) + (18,47 - 8,47)`

`= 50 + 10 = 60`

`2,`

Chiều dài của HCN đó là:

`36 \div \dfrac{3}{5} = 60 (cm)`

Đổi `60 cm = 0,6 m`; `36 cm = 0,36 m`

Sợi dây thép dài số m là:

`(0,6 + 0,36) \times 2 = 1,92 (m)`

Đáp số: `1,92m.`

45,25+52,17-15.28-12.17=(45.28-15.28)+(52.17-12.17)=30+50=80

(72.69+18.47)-(8.47+22.69)=72.69+18.47-8.47-22.69

=(72.69-22.69)+(18.47-8.47)

=50+10=60

mình nha

   45,28 + 52,17 - 15,28 - 12,17               

=(45,28 - 15,28)+(52,17- 12,17  )

=30+40=70     

   45,28 + 52,17 - 15,28 - 12,17

= ( 45,28 - 15,28 ) + ( 52,17 - 12,17 )

= 30 + 40

= 70

   ( 72,69 + 18,47 ) - ( 8,47 + 22,69 )

= 72,69 + 18,47 - 8,47 - 22,69

= ( 72,69 - 22,69 ) + ( 18,47 - 8,47 )

= 50 + 10

= 60

     _Hok tốt_

!!!