\(\frac{31}{25}\) + ( \(\frac{15}{16}\) - \(\frac{6}{15}\) ) + \(\frac{1}{16}\)

           = \(\frac{31}{25}\) + \(\frac{43}{80}\) + \(\frac{1}{16}\)

           = \(\frac{711}{400}\) + \(\frac{1}{16}\) 

           = \(\frac{46}{25}\)

\(\frac{31}{25}+\left(\frac{15}{16}-\frac{6}{15}\right)+\frac{1}{16}=\frac{31}{25}+\frac{15}{16}-\frac{6}{15}+\frac{1}{16}\) 

\(\frac{31}{25}-\frac{6}{15}+1=\frac{31}{25}-\frac{10}{25}+\frac{25}{25}=\frac{46}{25}\)

   31/25 + ( 15/16 - 6/15 ) + 1/16

= 31/25 + 15/16 - 6/15 + 1/16

= ( 31/25 - 6/15 ) + ( 15/16+ 1/16 )

= 21/5 + 1

= 46/25

Chú ý : / này là phần nha

= 

1

a) \(\frac{14}{7}+\frac{5}{9}+\frac{4}{9}-2\)

\(=2\frac{5}{9}+\frac{4}{9}-2\)

\(=3-2=1\)

b) \(\frac{31}{25}+\left(\frac{15}{16}-\frac{6}{15}\right)+\frac{1}{16}\)

\(=\frac{31}{25}+\frac{43}{80}+\frac{1}{16}\)

\(=1\frac{311}{400}+\frac{1}{16}\)

\(=1\frac{21}{25}\)

1) (-6 - 2) . (-6 + 2) = -8 . (-4) = 32
2) 627 + 125 + (-627) + |-46| -21 = 125 + 46 - 21 = 150
3) (-25) + 30 + (-16) + 25 + (-4) = 30 + (-20) = 10
4) 75 - 5.(15 - 40) - (-60) = 75 - 75 + 80 + 60 = 140
5) |31 - 17| - |15 - 52| = |14| - |-37| = 14 - 37 = -23
6) 13 - 18 - (-42) - 15 = 13 - 18 + 42 - 15 = 22
3 bài sau hết kiên nhẫn rồi, thông cảm nhé.

7) 369.4.[(- 5) + 4. (-8) ]

=  1476 . [(-5) + (-32)]

=  1476 . -37

=  -54612

8)  + 8

=  8 + 8

= 16
9) 72 : (-6 . 2 + 4)

= 72 : (-12 + 4)

= 72 : (-8)

= -9

k)(-37)+14+26+37

=(-37)+37+14+26

=0+14+26

=40

l)15+23+(-25)+(-23)

=15+(-25)+23+(-23)

=-10+0

=-10

n)25+37-48-25-37

=25-25+37-37-48

=0+0-48

=-48

o)24.(16-5)-16.(24-5)

=24.16-24.5-16.24-16.5

=0-24.5-16.5

=0-(24-16).5

=0-8.5

=0-40

=-40

p)31.(-18)+31.(-81)-31

=31.(-18)+31.(-81)+31.(-1)

=31.[-18+(-81)+(-1)]

=31.(-100)

=-3100

q)-48+48.(-78)+48.(-21)

=48.(-1)+48.(-78)+48.(-21)

=48.[(-1)+(-78)+(-21)]

=48.(-100)

=-4800

r)(7.3-3):(-6)

=(7.3-1.3):(-6)

=(6.3):(-6)

=-3

s)-3.7-4.(-5)+1

=-21-(-20)+1

=-20-(-20)

=0

t(6.8-10:5)+3.(-7)

=(48-2)+(-21)

=46+(-21)

=25

Viết mỏi cả tay rồi.tick đi nhé

lớp 1 mà cậu

4.24.5²-(3³.18+3³.12)

=4.24.25-[27.(18+12)]

=(4.25).24-[27.30]

=100.24-810

=2400-810

=1590

4.24.5^2-(3^3.18+3^3.12)

31.15.7^2.4-31.49.40

1+2+3+4+5+6+7+8+9+10

1+3+5+7+9+11+13+15+19

2+6+10+14+22+23+26+34

5+8+11+14+17+20+23+26+29

1+6+11+16+21+26+31+36+41+47+51

10+13+16+19+22+25+28+31+34+37+40

5+7+9+11+13+15+17+3+8+13+18+23+28

4+7+10+13+16+19+5+9+13+17+21+25 = 1590

#HT#

Giải chi tiết cho mình nha

\(\dfrac{2}{5}+\dfrac{11}{15}=\dfrac{6}{15}+\dfrac{11}{15}=\dfrac{17}{15}\)

\(\dfrac{7}{8}-\dfrac{7}{9}=\dfrac{63}{72}-\dfrac{56}{72}=\dfrac{7}{72}\)

\(\dfrac{11}{13}\times\dfrac{26}{31}=\dfrac{22}{31}\)

\(\dfrac{16}{24}:4=\dfrac{16}{24}\times\dfrac{1}{4}=\dfrac{4}{24}=\dfrac{1}{6}\)

\(30:\dfrac{6}{5}=30\times\dfrac{5}{6}=25\)

\(\dfrac{9}{16}:4=\dfrac{9}{16}\times\dfrac{1}{4}=\dfrac{9}{64}\)

\(\dfrac{1}{2}:\dfrac{1}{3}\times\dfrac{8}{15}=\dfrac{1}{2}\times3\times\dfrac{8}{15}=\dfrac{4}{5}\)

2/5 + 11/15 = 17/15
7/8 - 7/9 = 7/72
11/13 x 26/31 = 22/31
16/24 : 4 = 1/6
30 : 6/5 = 25
9/16 : 4 = 9/64
1/2 : 1/3 x 8/15 = 3/2 x 8/15 = 4/5