a. 125 x 25 x 8

=(125x8) x25

=    1000 x25

= 25000

a. 125 x 25 x 8

= ( 125 x 8 ) x 25 

= 1000 x 25

= 25000

=1000x25=25000

Cái gì khó có gg ok

a)   175× 582-25 ×582

= ( 175 - 25 ) x 582

= 150 x 582

= 87300

b)   81 × 365 + 18 ×365 +365

=  81 × 365 + 18 × 365 + 365 x 1

= ( 81 + 18 + 1 ) x 365

= 100 x 365

= 36500

a) \(175\times582-25\times582\)

\(=582\times\left(175-25\right)\)

\(=582\times150\)

\(=87300\)

b) \(81\times365+18\times365+365\)

\(=81\times365+18\times365+365\times1\)

\(=365\times\left(81+19+1\right)\)

\(=365\times100=36500\)

giải giùm mình nhen mn. lu

\(a,\left(25\times32\right):8=25\times\left(32:8\right)=25\times4=100\\ b,\left(56\times125\right):7=\left(56:7\right)\times125=8\times125=1000\)

=100

=1000

a: \(17,5\cdot4\cdot3\cdot25\)

\(=17,5\cdot3\cdot\left(4\cdot25\right)\)

\(=52,5\cdot100=5250\)

b: \(25,6\cdot7,5+25,6\cdot2,5\)

\(=25,6\left(7,5+2,5\right)\)

\(=25,6\cdot10=256\)

c: \(4,52\cdot12,5-2,5\cdot4,25\)

\(=2,5\left(4,52\cdot5-4,25\right)\)

\(=2,5\cdot18,35=45,875\)

d: \(7,7\cdot9+7,7\)

\(=7,7\left(9+1\right)\)

\(=7,7\cdot10=77\)

Câu 9: Tính bằng cách thuận tiện nhất:

=>876x(64-54)=876x10=8760

b) 37 × 25 + 37 × 35 + 37 × 39 + 37

37x(25+35+39)=37x99=3663

Chúc em học tốt

a) 876 × 64 – 876 × 54

=(64-54) x 876=10 x 876=8760

a) 4 x 78 x 5

= (4 x 5) x 78

= 20 x 78

= 1560

b) 2 x 99 x 5

= (2 x 5) x 99

= 10 x 99

= 990

\(7,\)

\(a,=\left(4\times5\right)\times78=20\times78=1560\)

\(b,=\left(2\times5\right)\times99=10\times99=990\)

a. 4 x 78 x 5 = 4 x 5 x 78 = 20 x 78 = 1560

b. 2 x 99 x 5 = 2 x 5 x 99 = 10 x 99 = 990

\(a,\\7,82+1,47+0,18\\=(7,82+0,18)+1,47\\=8+1,47\\=9,47\\---\\b,\\2,71+5,9+1,29+33,1\\=(2,71+1,29)+(5,9+33,1)\\=4+39\\=43\\\text{#}Toru\)

a: 7,82+1,47+0,18

=7,82+0,18+1,47

=8+1,47

=9,47

b: 2,71+5,9+1,29+33,1

=2,71+1,29+5,9+33,1

=4+39

=43

thanks

(135 × 25) : 45

= (135 : 45) × 25

= 3 × 25

= 75