a) 5,4 x 1,2 - 1,06 x4 + 15,2 x 2,5                         b) 8,3 x (6,25- 1,27): 0,25

= 6,48- 4,24 + 38                                                = (8,3 x 4,98) : 0,25

= 2,24 + 38                                                        = 41,334 : 0,25

= 40,24                                                             = 165,336

c) (34,08 - 41,2 x 0,75 ) x 10,2                          d) (31,02+ 1998x 0,01): 0,25

= 3,18 x 10,2                                                     = 51 : 0,25

= 32,436                                                          = 204

a) 1,25 x 16,84 = 21,05 ; 1,2 x 15,8 = 18,96.

b) 12,48 : 0,5 x 6,25 x 4 x 2 : 2 x 3,12x 1,25 : 0,25 x 10 = 32448.

k mình nha

1,25 x 16, 84 = 21,05

1,2 x 15,8= 18,96

12,48 : 0,5 x 6,25 x 4 x 2/2 x 3,12 x 1,25: 0,25 x 10

2/2 = 1

12,48 : 0,5 x 6,25x 4 x 1 x 3,12x1,25 :0,25 x10 =97,344

chúc bạn học tốt nha ^^

 BÚ

12 , 48   :   0 , 5   x   6 , 25   x   4   x   2 2   x   3 , 12   x   1 , 25   :   0 , 25   x 10 = 12 , 48   x   2   x   6 , 25   x   4   x   2 2   x   3 , 12   x   1 , 25   x   4   x   10 = 4   x   5   x   2 10 = 4

=5/2

a) \(210:x=2,1:0,25=8,4\)

\(x=210:8,4=25\)

b) \(x.2+x.0,5=6,25\)

\(2,5x=6,25\)

\(x=6,25:2,5=2,5\)

c) \(x:0,25-x=15,6\)

\(3x=15,6\)

\(x=5,2\)

d) \(x:12,5=3,75.4=15\)

\(x=15.12,5=187,5\)

e) \(x.12,6-x.5,6=42\)

\(7x=42\)

\(x=6\)

g) \(x:0,1-x:4-x.0,75=2,25\)

\(10x-\dfrac{x}{4}-\dfrac{3x}{4}=2,25\)

\(9x=2,25\)

\(x=0,25\)

giúp mình gấp mn

2,68 x 25% + 3,27 x 0,25 + 2,3 x \(\dfrac{1}{4}\) + 1,75:4

2,68 x 0,25 + 3,27 x 0,25 + 2,3 x 0,25 + 1,75 x 0,25

= 0,25 x (2,68 + 3,27 + 2,3 + 1,75)

= 0,25 x [ (2,68 + 3,27 + 1,75) + 2,3]

= 0,25 x [7,7 + 2,3]

= 0,25 x 10

= 2,5