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47/15

47/15 

ai k mih k lại 

OK

\(a.14,52\div1,5-9,81\div1,5\)

\(=\left(14,52-9,81\right)\div1,5\)

\(=4,71\div1,5=3,14\)

\(b.\frac{5}{9}:\frac{4}{7}+\frac{13}{9}\times\frac{7}{4}\)

\(=\frac{5}{9}\times\frac{7}{4}+\frac{13}{9}\times\frac{7}{4}\)

\(=\left(\frac{5}{9}+\frac{13}{9}\right)\times\frac{7}{4}\)

\(=\frac{18}{9}\times\frac{7}{4}\)

\(=2\times\frac{7}{4}\)

\(=\frac{7}{2}\)

14,52:1,5-9,81:1,5=( 14,52-9,81 ) : 1,5

=4,71:1,5

=3,14

con thứ 2 thì mình chịu, bạn tự làm nha.

học tốt lên nhé.  mình chỉ biết làm luôn thôi nhé.

a ) = ( 14,52 - 9,81 ) : 1,5

= 4,71 : 1,5 

= 3,14

b) = 5/9 * 7/4 + 13/9 * 7/4

    = ( 5/9+ 13/9 ) * 7/4

    =         2         * 7/4

    =          3,5 = 7/2

a) 14,25 : 1,5 - 9,81 : 1,5 = (14,25 - 9,81) : 1,5 

                                     = 4,44 : 1,5 

                                     = 2,96

b) \(\frac{5}{9}\): \(\frac{4}{7}+\frac{13}{9}\) * \(\frac{7}{4}\) = \(\frac{5}{9}\cdot\frac{7}{4}+\frac{13}{9}\cdot\frac{7}{4}\)

                                                = \(\left(\frac{5}{9}+\frac{13}{9}\right)\cdot\frac{7}{4}\)

                                                 = 2 \(\cdot\frac{7}{4}\)

                                                = \(\frac{7}{2}\)

thang nay rot vl

1; = ( -4/10 + 3/10 ) : ( -2/5 + 2/3 ) = -1/10 : ( -6/15 + 10/15 ) = -1/10 : 4/15 = -1/10 . 15/4 = -15/40 = -3/8

2; = 25/2 . -5/7 + 39/4 + -3/2 . 5/7 = -125/14 + 39/4 + -15/14 = ( -125/14 + -15/14 ) + 39/4 = -10 + 39/4 = -40/4 + 39/4 = -1/4

3; = 5/52 + 35/52 + 40/52 = 40/52 + 40/52 = 80/52 = 20/13

4; = ( -39/52 + 20/52 ) . 7/2 - ( 117/52 + 32/52 ) . 7/2 = -19/52 . 7/2 - 149/52 . 7/2 = ( -19/52 + -149/52 ) . 7/2 = -168/52 .7/2 = -147/13

5; = ( 36/12 + -9/12 + 8/12 ) - ( -12/6 + -8/6 + -9/6 ) - ( 6/6 - 14/6 - 27/6 ) = 35/12 + 10/12 + 70/12 = 115/12

6; = -1/3 + -8/35 +-2/9 + -1/135 +4/5 +-4/9 +3/7 = (-1/3 + -2/9 + -4/9 ) + ( -8/35 + 4/5 + 3/7 ) + -1/135 = ( -1/3 + -2/3 ) + ( -8/35 + 28/35 + 15/35 ) + -1/135 = -1 + 1 + -1/135 = -1/135

tui thay ban Huy dot do

9: =3/2*5/12+3/16

=15/24+3/16

=5/8+3/16

=13/16

tham khảo

a. 5/8

b. 29/28

c. -1/36

d. -41/24

e. -341/273

f. -17/5

g. -4

Giải:

a) \(\left(9\dfrac{4}{9}+5\dfrac{2}{3}\right)-5\dfrac{1}{2}\) 

\(=\left(\dfrac{85}{9}+\dfrac{17}{3}\right)-\dfrac{11}{2}\) 

\(=\dfrac{136}{9}-\dfrac{11}{2}\) 

\(=\dfrac{173}{18}\) 

b) \(\dfrac{13}{9}.\dfrac{15}{4}-\dfrac{13}{9}.\dfrac{7}{4}-\dfrac{13}{9}.\dfrac{5}{4}\) 

\(=\dfrac{13}{9}.\left(\dfrac{15}{4}-\dfrac{7}{4}-\dfrac{5}{4}\right)\) 

\(=\dfrac{13}{9}.\dfrac{3}{4}\) 

\(=\dfrac{13}{12}\) 

c) \(\dfrac{2}{3}+\dfrac{5}{8}-\dfrac{-1}{3}+0,375\) 

\(=\left(\dfrac{2}{3}-\dfrac{-1}{3}\right)+\left(\dfrac{5}{8}+\dfrac{3}{8}\right)\) 

\(=1+1\) 

\(=2\)

d) \(75\%-3\dfrac{1}{2}+1,5:\dfrac{10}{7}\) 

\(=\dfrac{3}{4}+\dfrac{7}{2}+\dfrac{3}{2}:\dfrac{10}{7}\) 

\(=\dfrac{3}{4}+\dfrac{7}{2}+\dfrac{21}{20}\) 

\(=\dfrac{53}{10}\) 

e) \(1\dfrac{13}{15}.\left(0,5\right)^2.3+\left(\dfrac{8}{15}-1\dfrac{19}{60}\right):1\dfrac{23}{24}\) 

\(=\dfrac{28}{15}.\dfrac{1}{4}.3+\left(\dfrac{8}{15}-\dfrac{79}{60}\right):\dfrac{47}{24}\) 

\(=\dfrac{7}{5}+\dfrac{-47}{60}:\dfrac{47}{24}\) 

\(=\dfrac{7}{5}+\dfrac{-2}{5}\) 

\(=1\)