83,75 + 46,98 + 6,25 = (83,75 + 6,25) + 46,98 = 90 + 46,98 = 136,98

Đề không đúng. Bạn xem lại đề.

5,87 + 28,69 + 4,13 = (5,87 + 4,13) + 28,69 = 10 + 28,69 = 38,69

không có cách nào thuận tiện nhất .

5.87+28.69+14.3=(5.78+14.3)+28.69

                          =20+28.69=48.69

5,87 + 28,69 + 14,3

= ( 5,87 + 14,3 ) + 28,69

= 20,17 + 28,69 

= 48,86

6,25:0,5+6,25:0,125

=6.25:\(\dfrac{1}{2}\)+6.25:\(\dfrac{1}{8}\)

=6.25.2+6.25.8

=6.25(2+8)

=6.25.10=62.5

Ta có: \(6.25:0.5+6.25:0.125\)

\(=\dfrac{25}{4}\cdot2+\dfrac{25}{4}\cdot8\)

\(=\dfrac{25}{4}\cdot\left(2+8\right)=\dfrac{25}{4}\cdot10=\dfrac{125}{2}\)

`6,25 : 0,25 + 6,25 xx 7 - 6,25`

`= 6,25 : 1/4 + 6,25 xx7-6,25 xx1`

`=6,25 xx 4 + 6,25xx7-6,25xx1`

`=6,25 xx (4+7-1)`

`=6,25 xx10`

`=62,5`.

\(6.25:0.25+6.25\times7-6.25\)

\(=6.25\times4+6.25\times7-6.25\)

\(=6.25\times\left(4+7-1\right)\)

\(=6.25\times10=62.5\)

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6,25 X 8 + 6,25 : 0,5

= 6,25 x 8 + 6,25 x 2

= 6,25 x ( 8 + 2)

= 6,25 x 10

= 62,5

14,75 + 8,96 + 6,25 = (14, 75 + 6,25) + 8,96

= 21 + 8,96

= 29,96

A 16,10

B 23

a) 6,25 + 3,1 + 8,75 = (6,25+8,75) + 3,1= 15 + 3,1= 18,1

b) 7,8 + 5,6 +6,2 + 3,4 =  (7,8 + 6,2) + (5,6 + 3,4) = 14 + 9 = 23

6,25 + 8,75 + 3,1 = 18,1

7,8+ 6,2+5,6+3,4=19