3,12 x 10,25 - 3,12 : 4

= 3,12 x 10,25 - 3,12 x \(\frac{1}{4}\)

= 3,12 x ( 10,25 - \(\frac{1}{4}\))

= 3,12 x 10

= 31,2

3,12x10,25-3,12:4 =3,12x10,25-3,12:1/4=3,12x(10,25-1/4)=3,12.10=31,2

có thể đổi 3,12x10,25-3,12x0,5 mà

`3,12:0,25+3,12:0,2+3,12:0,5+3,12xx89`

`=3,12xx4+3,12xx5+3,12xx2+3,12xx89`

`=3,12xx(4+5+2+89)`

`=3,12xx100 = 312`

\(3,12:\dfrac{1}{4}+3,12:\dfrac{1}{5}+3,12:\dfrac{1}{2}+3,12\times89\)

\(=3,12\times4+3,12\times5+3,12\times2+3,12\times89\)

\(=3,12\times\left(4+5+2+89\right)\)

\(=3,12\times100=312\)

16,88 + 9,76 + 3,12

= (16,88 + 3,12) + 9,76

= 20 + 9,76

= 29,76

3.12:0.25+12.48*3-3.12*6

=3.12*4+3.12*12-3.12*6

=3.12*(4+12-6)

=3.12*10

=31.2

= 3,12 x 4 + 3,12 x 4 x 3 - 3,12 x 6

= 3,12 x 4 +3,12 x 12 - 3,12 x 6

= 3,12 x ( 4 + 12 - 6 )

= 3,12 x 10

= 31,2

    3,12 : 0,25 + 12,48 x 3 - 3,12 x 6

=  3,12 x 4 + 3,12 x ( 4 x 3 ) - 3,12 x 6

= 3,12  x 4 + 3,12 x 12 - 3,12 x 6

= 3,12 x ( 4 + 12 - 6 )

= 3,12 x         10

= 31,2

3,12 : 0,25 + 12,48 x 3 - 3,12 x 6

=3,12 : 1/4 + 3,12 x 4 x 3 - 3,12 x 6

=3,12 x 4 + 3,12 x 12 - 3,12 x 6

=3,12 x (4 + 12 - 6)

=3,12 x 10

=31,2

   3,12 : 0,25 +12,48 x 3 - 3,12 x 6

= 3,12 x 4 + 3,12 x 12 - 3,12 x 6

=3,12 x (4 + 12- 6)

=3,12 x 10

= 31,2

7,5 x 2,5 x 0,04

= 7,5 x ( 2,5 x 0,04 )

= 7,5 x 0,1

= 0,75

3,12 x 8 x 1,25

= 3,12 x ( 8 x 1,25 )

= 3,12 x 10

= 31,2

câu cuối tớ 0 bt cách làm ==

2 x 3,12 x 1,25 : 0,25 x 10

= 6,24    x 1,25 x 4     x 10

= 6,24   x        5          x 10

=         6,24  x       50

=             312

12,48 : 0,5 x 6,25 x 4 x 2

= 12,48 x 2 + ( 6,25 x 4 ) x 2

= 12,48 x ( 2 x 2 ) x 25

= 12,48 x ( 4 x 25 )

= 12,48 x 100

= 1248

2 x 3,12 x 1,25 : 0,25 x 10

= 2 x 3,12 x 1,25 x 4 x 10

= 2 x 3,12 x 5 x 10

= ( 2 x 5 ) x 10 x 3,12

= 100 x 3,12

= 312

a: =3,12*9,6=29,952

b: =73,5(35,64+64,36)

=73,5*100=7350

=3,12x(1,25-0,25)

=3,12x10

=31,2

3,12 \(\times\) 10,25 - 3,12: 4

3,12 \(\times\) 10,25 - 3,12 \(\times\) 0,25

3,12 \(\times\) (10,25 - 0,25)

= 3,12 \(\times\) 10

= 31,2

=3.12*(1,25-0,25)

=3.12*10

=31.2