Theo thứ tự thì bạn đúng

a. - 7 - 9 = - (7 + 9) = - 16

b. - 15 - 8 = - (15 + 8) = - 23

c. - 28 - 32 = - (28 + 32) = - 60

d. - 43 - 32 = - (43 + 32) = - 75

e. - 5 - 9 - 11

= - (5 + 9 + 11)

= - (14 + 11)

= - 25

f. - 6 - 8 - 13

= - (6 + 8 + 13)

= - (14 + 13)

= - 27

g. - 3 - 7 - 25

= - (3 + 7 + 25)

= - (10 + 25)

= - 35

h. - 7 - 4 - 15

= - (7 + 4 + 15)

= - (11 + 15)

= - 26

Bài 1:

1: =15+37+52-37-17=52-2=50

2: =38-42+14-25+27+15=62-42+29=20+29=49

Bài 1: Bỏ ngoặc rồi tính

3) (21-32) - (-12+32)=21-32-(-12)-32=21-32+12-32=-31

4) (12+21) - (23-21+10)=12+21-23+21-10=21

5) (57-725) - (605-53)=57-725-605+53=-1220

6) (55+45+15) - (15-55+45)=55+45+15-15+55-45=55+55=110

Bài 2: Tính các tổng sau một cách hợp lí

1) (-37) + 14 + 26 + 37=(-37+37)+(14+26)=0+40=40

2) (-24) +6 + 10 + 24=(-24+24)+(6+10)=0+16=16

3) 15 + 23 + (-25) + (-23)=(15-25)+(23-23)=-10+0=-10

4) 60 + 33 + (-50) + (-33)=(60-50)+(33-33)=10+0=10

5) (-16) + (-209) + (-14) + 209=(-16-14)+(-209+209)=-30+0=-30

6) (-12) + (-13) + 36 + (-11)=(-11-12-13)+36=-36+36=0

=15+37+52-37-17 =(37-37)+52+15-17 =0+52+15-17 =67-17 =50

(38 – 42 + 14) – (25 – 27 – 15) =38-42+14-25+27+15 =27 c. -(21 – 32) – (-12 + 32) =-21+32+12-32 =-9 d. -(12 + 21 – 23) - (23 – 21 + 10) =-12-21+23-23+21-10 =-22 e. (57 – 725) – (605 – 53) =57-725-605+53 =-1220 f. (55 + 45 + 15) – (15 – 55 + 45) =55+45+15-15+55-45 =110

\(\frac{209}{56}\)

\(\dfrac{5}{6}-\dfrac{1}{3}=\dfrac{5}{6}-\dfrac{2}{6}=\dfrac{5-2}{6}=\dfrac{3}{6}=\dfrac{1}{2}\)

\(\dfrac{2}{5}\times\dfrac{15}{8}=\dfrac{2\times15}{5\times8}=\dfrac{30}{40}=\dfrac{3}{4}\)

=\(\sqrt{27+2.3\sqrt{3}.\sqrt{2}+2}-\sqrt{27-2.3\sqrt{3}.\sqrt{5}+5}\)

=\(\sqrt{\left(3\sqrt{3}+\sqrt{2}\right)^2}-\sqrt{\left(3\sqrt{3}-\sqrt{5}\right)^2}\)

=\(3\sqrt{3}+\sqrt{2}-|3\sqrt{3}-\sqrt{5}|\)

=\(3\sqrt{3}+\sqrt{2}-3\sqrt{3}+\sqrt{5}\)

=\(\sqrt{2}+\sqrt{5}\)

Chuc ban hoc tot

x + 10 - (32 + 48 : 6 - 15) = 0

x + 10 - (32 + 8 - 15)       = 0

x + 10 - 25                     = 0

x                                   = 0 + 25 - 10

x                                  =15

bay gio mk ranh rui mk lam cho

x+5.2-(32+16.3:6-15)=0

x+5.2-(32+48:6-15)   =0

x+5.2-(32+6-15)        =0

x+5.2-(38-15)            =0

x+5.2-23                   =0

x+10-23                    =0

x+10                         =0+23

x+10                         =23

                              x=23-10

                              x=13

chuc bn hoc gioi!

x+5.2-(32+16:3x6-15)=0

=> x+ 5+10-(32:32-15)=0

=> x+ 15- (-14)=0

=>x+15 +14=0

=> x= 0-14-15

=>x= -29