a) 14,75 + 8,96 + 6,26                                         

= 23,71 + 6,26

= 29,97

b) 66,79 – 18,89 – 12,11

= 47.89 - 12,11

= 35,78

14,75 * 5,5 - 14,75 * 4,5 - 14,75

= 14,75 * 5,5 - 14,75 * 4,5 - 14,75 * 1

= 14,75 * ( 5,5 - 4,5 - 1 )

= 14,75 * 0

= 0

Đảm bảo đúng

Mk học rùi

CHỊU

RÙI 

!!!

14,75x55-14,75x4,5-14,75

=14,75x5,5-14,75x4,5-14,75x1

=14,75x(5,5-4,5-1)

=14,75x0

=0

mik làm đầu.mik chắc chắn 100% luôn.nhớ k mik nha

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

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

e) [(17,75 - 1,25) : 1,5 + 1] x ( 17,75 + 1,25) :2 = 114

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

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

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`.

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

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

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

\(=6.25\times10=62.5\)

8,99 + 8,98 + 8,97+ 8,96 + 0,1

=(8,99 + 8,98 + 8,97+ 8,96) + 0,1

=35,9 + 0,1

=36

8.99 + 8.98 + 8.97 + 8.96 + 0.1

= ( 8.99 + 8.98 + 8.97 + 8.96 ) + 0.1

= 35.9 + 0.1

= 36

8,99 +8,98 +8,97 +8,96 +0,1

(8,99+ 8,98+ 8,97 +8,96)+ 0,1

   = 35,9+ 0,1

   = 36

tick cho mik nha:))