24.24+28.28+48.48=101

=(24+28+48).3

=100.3

=300

Tổng luôn là 101 đó chị nhớ k cho em nha

101

ai tích mk mk tích lại

24.24+28.28+48.48=101

2. \(54^{49}+54^{48}=54^{48}\left(54+1\right)=54.55=54.5.11\) chia hết cho 5 và 11

3.

+)Xét x=3k => (x+12)(x+20)(x+34)=(3k+12)(3x+20)(3k+34)=3(k+4)(3k+20)(3k+34) chia hết cho 3

+)Xét x=3k+1=>(x+12)(x+20)(x+34)=(3k+13)(3k+21)(3k+35)=(3k+13)3(k+7)(3k+35) chia hết cho 3

+)Xét x=3k+2=>(x+12)(x+20)(x+34)=(3k+14)(3k+22)(3k+36)=(3k+14)(3k+22)3(k+12) chia hết cho 3

Từ 3 trường hợp trên suy ra đpcm

\(a.\)

\(\dfrac{27}{13}-\dfrac{106}{111}+-\dfrac{5}{111}=\dfrac{27}{13}-\dfrac{106}{111}-\dfrac{5}{111}=\dfrac{27}{13}-\left(\dfrac{106+6}{111}\right)=\dfrac{27}{13}-1=\dfrac{14}{13}\)

\(b.\)

\(\dfrac{12}{11}-\dfrac{-7}{19}+\dfrac{12}{19}=\dfrac{12}{11}+\dfrac{7}{19}+\dfrac{12}{19}=\dfrac{12}{11}+1=\dfrac{23}{11}\)

\(c.\)

\(\dfrac{5}{17}-\dfrac{25}{31}+\dfrac{12}{17}+-\dfrac{6}{31}=\left(\dfrac{5}{17}+\dfrac{12}{17}\right)-\left(\dfrac{25}{31}+\dfrac{6}{31}\right)=1-1=0\)

a) \(\dfrac{27}{13}-\dfrac{106}{111}+\dfrac{-5}{111}=\dfrac{27}{13}+\left(\dfrac{-106}{111}+\dfrac{-5}{111}\right)=\dfrac{27}{13}+-1=\dfrac{14}{13}\) 

b) \(\dfrac{12}{11}-\dfrac{-7}{19}+\dfrac{12}{19}=\dfrac{12}{11}+\left(\dfrac{7}{19}+\dfrac{12}{19}\right)=\dfrac{12}{11}+1=\dfrac{23}{11}\) 

c)\(\dfrac{5}{17}-\dfrac{25}{31}+\dfrac{12}{17}+\dfrac{-6}{31}=\left(\dfrac{5}{17}+\dfrac{12}{17}\right)+\left(\dfrac{-25}{31}+\dfrac{-6}{31}\right)=1+-1=0\)

\(a,\dfrac{3}{5}+\dfrac{1}{5}.\dfrac{-17}{9}=\dfrac{3}{5}-\dfrac{17}{45}=\dfrac{27}{45}-\dfrac{17}{45}=\dfrac{10}{45}=\dfrac{2}{9}\\ b,\left(-\dfrac{4}{15}-\dfrac{18}{19}\right)-\left(\dfrac{20}{19}+\dfrac{11}{15}\right)=-\dfrac{4}{15}-\dfrac{18}{19}-\dfrac{20}{19}-\dfrac{11}{15}=\left(-\dfrac{4}{15}-\dfrac{11}{15}\right)-\left(\dfrac{18}{19}+\dfrac{20}{19}\right)=-1-2=-3\)

\(a,=\dfrac{3}{5}+\left(-\dfrac{17}{45}\right)=\dfrac{2}{9}\)

\(b,=-\dfrac{4}{15}-\dfrac{18}{19}-\dfrac{20}{19}-\dfrac{11}{15}=-3\)

a. 3/5+1/5.-17/9

=3/5+-17/45

=27/45+-17/45

=2/9

b. (-4/15-18/19)-(20/19+11/15)

=-4/15-18/19-20/19-11/15

=(-4/15-11/15)-(18/19-20/19)

=(-1)-(-2/19)

=(-19/19)-(-2/19)

=-17/19  

a.2/9
b.-3

a.2/9 b.(-3)

a.2/9
b.-3

C=2.2+4.4+6.6+...+48.48

C=2.(4-2)+4.(6-2)+6.(8-2)+...+48.(50-2)

C=2.4-2.2+4.6-4.2+6.8-6.2+...+48.50-48.2

C=(2.4+4.6+6.8+...+48.50)-(2.2+4.2+6.2+...+48.2)

Đặt D=2.4+4.6+6.8+...+48.50

6D=2.4.6+4.6.6+6.8.6+...+48.50.6

6D=2.4.6+4.6.(8-2)+6.8.(10-4)+...+48.50.(52-46)

6D=2.4.6+4.6.8-2.4.6+6.8.10-4.6.8+...+48.50.52-46.48.50

6D=48.50.52

D=20800

ĐặtE=2.2+4.2+6.2+...+48.2

E=(2+4+6+...+48).2

đến đấy rồi bạn tình tổng 2+4+6+...+48 rồi bạn tự làm tiếp nhé

nhớ tick cho mình.Thanks bạn 

Ta có: 24.24+28.28+48.48

= 24.24+(24+4).(24+4)+(24+24).(24+24)

=24.24+24.24+4.24+24.4+4.4+24.24+24.24+24.24+24.24

= ( 24.24+24.24+24.24+24.24+24.24+24.24)+4.24+4.24+4.4

= 6(24.24)+24.8+4.4

= (6.24+6.24+24.8)+4.4

= 24.20+4.4

= 4.6.4.5+4.4

= 4.4(6.5+1)

= 16.(30+1)

= 16.31

Ta có: 24.24+28.28+48.48

= 24.24+(24+4).(24+4)+(24+24).(24+24)

=24.24+24.24+4.24+24.4+4.4+24.24+24.24+24.24+24.24

= ( 24.24+24.24+24.24+24.24+24.24+24.24)+4.24+4.24+4.4

= 6(24.24)+24.8+4.4

= (6.24+6.24+24.8)+4.4

= 24.20+4.4

= 4.6.4.5+4.4

= 4.4(6.5+1)

= 16.(30+1)

= 16.31

Ta có: 24.24+28.28+48.48

= 24.24+(24+4).(24+4)+(24+24).(24+24)

=24.24+24.24+4.24+24.4+4.4+24.24+24.24+24.24+24.24

= ( 24.24+24.24+24.24+24.24+24.24+24.24)+4.24+4.24+4.4

= 6(24.24)+24.8+4.4

= (6.24+6.24+24.8)+4.4

= 24.20+4.4

= 4.6.4.5+4.4

= 4.4(6.5+1)

= 16.(30+1)

= 16.31