25/2

181/5

247/2

71/5

a)`1,25 + 1,25 xx 2 + 7 xx 1,25=1,25 xx (1+2+7) = 1,25 xx 10 =12,5`

b)`3,62xx12–2xx0,362xx10=3,62 xx 12 -2 xx 3,62=3,62xx(12-2)=3,62xx10=36,2`

c)`12,35xx15–1,235xx10xx6+12,35=12,35xx15–12,35xx6+12,35=12,35xx(15-6+1)=12,35xx10=123,5`    

d)`1,42 : 0,5 + 1,42 xx 8=1,42xx2+1,42xx8=1,42xx(2+8)=1,42xx10=14,2`

\(1,25:0,5+1,25\times8\\ =1,25\times2+1,25\times8\\ =1,25\times\left(2+8\right)\\ =1,25\times10\\ =12,5\)

`=1,25xx(1+2+7)=1,25xx10=12,5`

a) = 1,25 x ( 2 + 7 + 1 )

= 1,25 x 10

= 12,5

12,5

= ( 1,25 x 8 ) x ( 4 x 0,25 ) x ( 0,5 x 8 ) x 135,3

= 10 x 1 x 4 x 135,3

= 10 x 4 x 135,3

= 40 x 135,3

= 5412

sai rồi bạn nhé

sai đâu vậy ?

a:1,25*59*1,25*41

=1,25*(59*41)

=1,25*2419

=3023,75

b:77,28*20,2+22,72*20,2

=20,2*(77,28+22,72)

=20,2*100

=2020

c

:1,25*59*1,25*41

=1,25*(59*41)

=1,25*2419

=3023,75

d:2,5*46+54*2,5

=2,5*(46+54)

=2,5*100

=250

Tính bằng cách thuận tiện nhất:

a) 1,25 x 3,6 + 2,5 x 7,2 x 5 -1,25 x 8

= 1,25 x 4 x 0,9 + 2,5 x 2 x 3,6 x 5 - 1,25 x 4 x 2

= 5 x 0,9 + 5 x 18 - 5 x 2 

= 4,5 + 90 - 10

= 84,5

b) 4,16 x 4/5 -80% x 0,16 + 0,96: 1,2

= 4,16 x 0,8 - 0,8 x 0,16 + 0,8

= 0,8 x (4,16 - 0,16 + 1)

= 0,8 x 5 = 4

3,5 x 8 x 3 x 1,25

= ( 1,25 x 8 ) x ( 3 x 3,5 )

= 10 x ( 3 x 3,5 )

= 10 x 10,5

= 105

nha bn

\(3,5\times8\times3\times1,25\)

\(=\left(8\times1,25\right)\times\left(3,5\times3\right)\)

\(=10\times10,5\)

\(=105\)

3,5x8x3x1,25

=[3,5x8]x3x1,25

=28x3x1,25

=84x1,25

=105

chúc bạn học giỏi hơn

tk mình nha

\(1,25+2.1,25+1,25.3\)

\(=1,25.\left(1+2+3\right)\)

\(=1,25.6\)

\(=7,5\)

\(1,25+2.1,25+1,25.3\)

\(=1,25.\left(1+2+3\right)\)

\(=1,25.6\)

\(=7,5\)

1,25 + 2 x 1,25 + 1,25 x 3

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

= 1,25 x 6

= 7,5