ghép cặp vào ra 28 nha

Bằng 28.

Vậy mà cũng ko biết

\(19+28+28+26+36+69-69-36-26\)\(-28-19\)

=\(19-19+28-28+26-26+36-36+69-69+28\)

=\(0+0+0+0+0+28\)

=\(28\)

\(\dfrac{-3}{26}+2\dfrac{4}{69}\)

\(=\dfrac{-3}{26}+\dfrac{142}{69}\)

\(=\dfrac{-3.69}{26.69}+\dfrac{142.26}{26.69}\)

\(=\dfrac{-207+3692}{1794}\)

\(=\dfrac{3485}{1794}\)

-3/26 + 2 và 4/69 = 3485/1794

69x57 =3933

28+11=39

26+19=45

39+6=45

3933

33

45

45

69 x 57 = 3933

28 + 11 =39

26 + 19 = 245

39 + 6 = 45

chúc bạn học giỏi !

a)  1 3 + − 1 3 + 1 3 = 1 3

b)  − 1 3 + 2 5 + − 2 3 + 4 5 = 1 5

a)  1 3 + − 2 6 + 3 9 = 1 3 + − 1 3 + 1 3 = 1 3

b)  − 4 12 + 18 45 + − 6 9 + 24 30 = − 1 3 + 2 5 + − 2 3 + 4 5 = − 1 + 6 5 = 1 5

a)=20.(-6)+42.(-20)

=-120+(-840)=-960

b)=-15.26-26.(-24)

=-390+624=234

c)=-54.9+35.(-119)

=-486-4165=-4651

d)=25.(-72+21-49)

=25.(-100)=-2500

1) $(-35)\cdot18+28\cdot35$

$=35\cdot(-18)+28\cdot35$

$=35\cdot(-18+28)$

$=35\cdot10$

$=350$

2) $53\cdot29-47\cdot(-29)$

$=53\cdot29-47\cdot(-1)\cdot29$

$=53\cdot29+47\cdot29$

$=29\cdot(53+47)$

$=29\cdot100$

$=2900$

3) $125\cdot(-24)+24\cdot225$

$=(-125)\cdot24+24\cdot225$

$=24\cdot(-125+225)$

$=24\cdot100$

$=2400$

4) $26\cdot(-121)-121\cdot(-36)$

$=-121\cdot[26+(-36)]$

$=-121\cdot(26-36)$

$=-121\cdot(-10)$

$=121\cdot10$

$=1210$

5) $65\cdot(-25)+25\cdot(-23)$

$=-65\cdot25+25\cdot(-23)$

$=25\cdot(-65-23)$

$=25\cdot(-88)$

$=-2200$

6) $237\cdot(-26)+26\cdot137$

$=-237\cdot26+26\cdot137$

$=26\cdot(-237+137)$

$=26\cdot(-100)$

$=-2600$

7) $30\cdot(-125)+25\cdot30$

$=30\cdot(-125+25)$

$=30\cdot(-100)$

$=-3000$

8) $(-37)\cdot69+(-31)\cdot37$

$=37\cdot(-69)+37\cdot(-31)$

$=37\cdot(-69-31)$

$=37\cdot(-100)$

$=-3700$

9) $31\cdot72-31\cdot70-31\cdot2$

$=31\cdot(72-70-2)$

$=31\cdot(2-2)$

$=31\cdot0$

$=0$

10) $(-12)\cdot47+(-12)\cdot52+(-12)$

$=-12\cdot(47+52+1)$

$=-12\cdot100$

$=-1200$

$\text{#}Toru$

\(a)\dfrac{-3}{26}+2\dfrac{4}{69}\)

\(=\) \(\dfrac{-3}{26}\) + \(\dfrac{142}{69}\)

\(=\) \(\dfrac{-207}{1794}\) + \(\dfrac{3692}{1794}\)

\(=\) \(\dfrac{\left(-207\right)+3692}{1794}\)

\(=\) \(1,942586399\)