= -97/1176 ^{lớp 4 học số âm à???}

-97/1176 

-97/1176 

KHO THE

\(A=\frac{\left[\left(25-1\right):1+1\right]\left(25+1\right)}{2}=325.\)

\(B=\frac{\left[\left(51-3\right):2+1\right]\left(51+3\right)}{2}=675\)

\(C=\frac{\left[\left(81-1\right):4+1\right]\left(81+1\right)}{2}=861\)

\(=\left(1+3+...+2021\right)\cdot\left[1001\cdot135\cdot137-1001\cdot135\cdot137\right]\)

\(=\left(1+3+...+2021\right)\cdot0\)

=0

= (1 + 3 + ... + 2021) x (135 x 1001 x 137 - 135 x 137 x 1001)

= (1 + 3 + ... + 2021) x 0

= 0

` ( 1+ 3 + 5 + 7 + ... + 2021 ).(135135.137 - 135.137137 )`

` = ( 1+ 3 + 5 + 7 + ... + 2021 ). ( 18513495 - 18513495)`

` = ( 1+ 3 + 5 + 7 + ... + 2021 ). 0`

` = 0`

9/20

44/35

155/9

52/35

a,\(=\dfrac{9}{20}\)
b,\(=\dfrac{44}{35}\)
c,\(=\dfrac{155}{9}\)
d,\(=\dfrac{52}{35}\)

9/20

44/35

155/9

52/35

\(=\dfrac{3}{2}-\dfrac{2}{21}-\dfrac{7}{12}+\left[\dfrac{15}{21}-\dfrac{1}{3}+\dfrac{5}{4}-\dfrac{2}{7}-\dfrac{1}{3}\right]\)

=11/12-2/21+5/7-2/3+5/4-2/7

=11/12-2/3+5/4-2/21+3/7

=11/12-8/12+15/12-2/21+9/21

=18/12+7/21

=3/2+1/3

=9/6+2/6=11/6

\(B=\dfrac{3}{2}-\dfrac{2}{21}-\left\{\dfrac{7}{12}-\left[\dfrac{15}{21}-\left(\dfrac{1}{3}-\dfrac{5}{4}\right)-\left(\dfrac{2}{7}+\dfrac{1}{3}\right)\right]\right\}\)

\(B=\dfrac{3}{2}-\dfrac{2}{21}-\left\{\dfrac{7}{12}-\left[\dfrac{15}{21}-\left(-\dfrac{11}{12}\right)-\dfrac{13}{21}\right]\right\}\)

\(B=\dfrac{3}{2}-\dfrac{2}{21}-\left\{\dfrac{7}{12}-\dfrac{85}{84}\right\}\)

\(B=\dfrac{3}{2}-\dfrac{2}{21}-\left(-\dfrac{3}{7}\right)\)

\(B=\dfrac{11}{6}\)

2/3 + 7/1 = 2/3 + 7 = 2/3 + 21/3 = 23/3

25/48 + 11/24 = 25/48 + 22/48 = 47/48

5/7 + 3/8 = 40/56 + 21/56 = 61/56

15/24 + 12/6 = 5/8 + 2 = 5/8 + 16/8 = 21/8

5/6 + 4/3 = 5/6 + 8/6 = 13/6

3/8 + 7/12 = 9/24 + 14/24 = 23/24

= 23/3

= 47/48

=61/56

=21/8

=13/6

= 23/24

Cảm ơn mn nhìu nhaaaaaa

\(\frac{2}{7}+\frac{5}{7}=\frac{7}{7}=1\)

\(\frac{8}{15}+\frac{6}{15}=\frac{14}{15}\)

\(\frac{2}{3}+\frac{3}{9}+\frac{4}{9}=\frac{6}{9}+\frac{3}{9}+\frac{4}{9}=\frac{9}{9}+\frac{4}{9}=\frac{13}{9}\)

1,14/15,13/9,

2/7 + 5/7 = 7/7 = 1

8/15 + 6/15 = 14/15

2/3 + 3/9 + 4/9 = 6/9 + 3/9 + 4/9 = 13/9

bạn ơi có bị sai đề ko bạn ko số nào chia được cho 0 đâu

00000000000000000000000

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