Trả lời 

\(3,7.3,8+8,2.3,7-0,4.3,7.5\)

\(=3,7\left(3,8+8,2-2\right)=3,7.10=37\)

       \(3,7\times3,8+8,2\times3,7-0,4\times3,7\times5\)

\(=3,7\times\left[3,8+8,2-\left(0,4\times5\right)\right]\)

\(=3,7\times\left(3,8+8,2-2\right)\)

\(=3,7\times10\)

\(=37\)

\(3,7\times3,8+6,2\times3,7\\ =3,7\times\left(3,8+6,2\right)\\ =3,7\times10\\ =37\\ 56,8\times76,9-56,8\times76,8\\ =56,8\times\left(76,9-76,8\right)\\ =56,8\times0,1\\ =5,68\)

a)\(3,7\times3,8+6,2\times3,7\)
\(=3,7\times\left(3,8+6,2\right)\)
\(=3,7\times10=37\)
b)\(56,8\times76,9-56,8\times76,8\)
\(=56,8\times\left(76,9-76,8\right)\)
\(=56,8\times0,1=5,68\)

a,=3,7 x (3,8+6,2)=37

b,=56,8x(76,9-76,8)=5,68

 172 x 41 + 172 x 58 + 172

= 172 x ( 41 + 58 + 1 )

= 172 x 100

= 17200

\(172\times41+172\times58+172\\ =172\times\left(41+58+1\right)\\ =172\times100\\ =17200\)

= 172 x (41 + 58 + 1 )

= 172 x 100

= 17200

câu trả lời là:

 39

k mình 

nha

Bằng 39 nhé

=39.nha ban lan sau hoi cau de hon nha

Lời giải:
$3,8\times 2+1,9\times 8+7,6\times 2-17,7$

$=1,9\times 2\times 2+1,9\times 8+1,9\times 4\times 2-17,7$

$=1,9\times 4+1,9\times 8+1,9\times 8-17,7$

$=1,9\times (4+8+8)-17,7$

$=1,9\times 20-17,7=38-17,7=20,3$

1465

1465

1465

b, 3,8 x 4,54 + 3,6 : 1,5 + 5,46 x 3,8 - 2,1 : 1,5

= 3,8 x (4,54 + 5,46) + 1,5 : (3,6 - 2,1)

= 3,8 x 10 + 1,5 : 1,5

= 38 + 1 = 39

ko biet

1 và37,37