\(-15,5.20,8+3,5.9,2-15,5.9,2+3,5.20,8\)

\(=-15,5\left(20,8+9,2\right)+3,5\left(9,2+20,8\right)\)

\(=\left(-15,5\right).30+3,5.30\)

\(=30.\left(-12,5\right)\)

\(=-375\)

\(-15,5.20,8+3,5.9,2-15,5.9,2+3,5.20,8\)

\(=20,8.\left(-15,5+3,5\right)+9,2.\left(-15,5+3,5\right)\)

\(=\left(-15,5+3,5\right).\left(20,8+9,2\right)\)

\(=\left(-12\right).30\)

\(=-360\)

Vậy : \(-15,5.20,8+3,5.9,2-15,5.9,2+3,5.20,8=-360\)

\(-15,5.20,8+3,5.9,2-15,5.9,2+3,5.20,8\)

= \(20,8.\left(-15,5+3,5\right)+9,2.\left(-15,5+3,5\right)\)

= \(20,8.\left(-12\right)+9,2.\left(-12\right)\)

= \(\left(20,8+9,2\right).\left(-12\right)\)

= \(30.\left(-12\right)\)

= \(-360.\)

Chúc bạn học tốt!

    3,25 : 0,125 + 3,25 : 0,5 + 3,25 : 0,25 + 3,25 : 0,5  + 3,25

= 3,25 x 8 + 3,25 x 2 + 3,25 x 4 + 3,25 x 2 + 3,25 x 1

= 3,25 x (8 + 2 + 4 + 2 + 1)

= 3,25 x (10 + 4 + 2 + 1)

= 3,25 x (14 + 2 + 1)

= 3,25 x (16 + 1)

= 3,25 x 17

= 55,25

= -15,5 .( 20,8 - 9,2) + 3,5 . (9,2+20,8)

=-15,5 . 11,6 + 3,5 .30

=-179,8+105

=-74,8

\(-15,5.20,8+3,5.9,2-15,5.9,2+3,5.20,8\)

\(=-15,5\left(20,8+9,2\right)+3,5\left(9,2+20,8\right)\)

\(=\left(9,2+20,8\right)\left(-15,5+3,5\right)\)

\(=30.\left(-12\right)=-360\)

3,25x20+3,25x50+3,25x30

=3,25x(20+30+50)

=3,25x100

=325

3,25x(20+50+30)

=3,25x100

=325

3,25*20+3,25*50+3,25*30

=3,25*(20+50+30)

=3,25*100

=325

lời giải đầy đủ k mình nhé

A) -15,5 x 20,8 +2,5 x 9,2 -15,5 x 9,2 + 3,5 x 20,8

=-15,5 x 20,8 + 2,5 x 9,2 + -15,5 x 9,2 +3,5 x 20,8

=[20,8x(-15,5+3,5)]+[9,2x(2,5+-15,5)]

=[20,8x(-12)]+[9,2x(-13)]

=-249,6+-119,6

=-369,2

a) -369,2

b) -7

B)(-3/4+5/13):2/7-(9/4-8/13):2/7

=(-19/52-85/52):2/7

=-2:2/7

=-7

3,25 : 0,5 + 3,25 x 4 + 3,25 : 0,25

= 3,25 x 2 + 3,25 x 4 + 3,25 x 4

= 3,25 x (2 + 4 + 4)

= 3,25 x 10

= 32,5