69,78 + 35,97 + 30,22 = (69,78 + 30,22) + 35,97=100 + 35,97=135,97

(  69,78+30,22)+35,97

100+35,97

135,97

cho m nha

a)69,78 + 35,97 + 30,22

=(69,78+30,22)+35,97

=100 + 35,97

=135,97

b)83,45 - 30,98 - 42,47

=83,45-(30,98+42,47)

=83,45-73,45

=10

a) (69,78+30,22)+35,97

=100+35,97

=135,97

\(\frac{72}{99}-\frac{28}{99}-\frac{14}{99}=\frac{72-28-14}{99}\)\(=\frac{30}{99}=\frac{10}{33}\)

\(\left(69,78+30,22\right)+35,97\)\(=100+35,97=135,97\)

\(83,45-\left(30,98+42,47\right)\)\(=83,45-73,45=10\)

72/99-28/99-14/99

=72/99-(28/99+14/99)

=72/99-42/99

=30/99=10/33

67,78+35,97+30,22

=(67,78+30,22)+35,97

=98+35,97

=133,97

83,45-30,98-42,47

=83,45-(30,98+42,47)

=83,45-73,45

=10

mình kick cho bạn, bạn kick cho mình

a) 7/11+3/4+4/11+1/4

=(7/11+4/11)+(3/4+1/4)

=     1           +    1

=          2.

b) 72/99-28/99-14/99

=72/99-(28/99+14/99)

=72/99-      42/99

=     30/99=10/33.

c) 69,78+35,97+30,22

=(69,78+30,22)+35,97

=      100          +35,97

=                 135,97.

d) 83,45-30,98-42,47

=83,45-(30,98+42,47)

=83,45-      73,45

=        10.

a) 2

b) 10/33

c) 135,97

d) 10

a: (7/11+4/11)+(3/4+1/4)

=11/11+4/4

=1+1=2

b: 72/99-28/99-14/99

=72/99-(28/99+14/99)

=72/99-42/99

=30/99

=10/33

c: 69,78+35,97+30,22

=(69,78+30,22)+35,97

=100+35,97

=135,97

d :83,45-(30,98+42,47)

=83,45-73,45

=10

a) \(\dfrac{7}{11}+\dfrac{3}{4}+\dfrac{4}{11}+\dfrac{1}{4}=\left(\dfrac{7}{11}+\dfrac{4}{11}\right)+\left(\dfrac{3}{4}+\dfrac{1}{4}\right)=1+1=2\)

b) \(\dfrac{72}{99}-\dfrac{28}{99}-\dfrac{14}{99}=\dfrac{72-28-14}{99}=\dfrac{30}{99}=\dfrac{10}{33}\)

c) \(69.78+35.97+30.22=\left(69.78+30.22\right)+35.97=100+35.97=135.97\)

\(a,=69,78\times\left(\dfrac{3}{4}+\dfrac{1}{4}+99\right)\\ =69,78\times\left(\dfrac{4}{4}+99\right)\\ =69,78\times\left(1+99\right)=69,78\times100=6978\\ b,34,1\times8+34,1\times0,5\\ =34,1\times\left(8+0,5\right)\\ =34,1\times8,5\\ =289,85\)

a: =69,78(3/4+1/4+99)

=69,78*100

=6978

b: =34,1(8+0,5)=34,1*8,5=289,85

a.\(69,78\times\dfrac{3}{4}+69,78\times\dfrac{1}{4}+69,78\times99=69,78\times\left(\dfrac{3}{4}+\dfrac{1}{4}+99\right)=69,78\times100=6978\)

b. \(34,1\times8+34,1\times0,5=34,1\times\left(8+0,5\right)=34,1\times8,5=289,85\)

6978 nha

TL:

=69,78 x (75% + 1/4 + 99)

=69,78 x (3/4 + 1/4 + 99)

= 69,78 x (1 + 99)

= 69,78 x 100

= 6978

HT

69,78 x 75% + 69,78 x \(\frac{1}{4}\) + 69,78 x 99

= 69,78 x 7,5 + 69,78 x 0,25 + 69,78 x 99

= 69,78 x ( 99 + 7,5 + 0,25 )

= 69,78 x 100

= 6978

7/11+3/4+4/11+1/4=(7/11+4/11)+(3/4+1/4)=1+1=2

\(\frac{7}{11}+\frac{3}{4}+\frac{4}{11}+\frac{1}{4}\)

\(=\left(\frac{7}{11}+\frac{4}{11}\right)+\left(\frac{3}{4}+\frac{1}{4}\right)\)

= 1 + 1

= 2

\(\frac{72}{99}-\frac{28}{99}-\frac{14}{99}\)

\(=\frac{72}{99}-\left(\frac{28}{99}+\frac{14}{99}\right)\)

\(=\frac{72}{99}-\frac{42}{99}\)

\(=\frac{30}{99}=\frac{10}{33}\)