a) 33-14-26-(-7)=[33-(-7)]-14-26=40-14-26=0

b) (-5)-25-(-34)-4=[(-5)-25]-(-34)-4=(-30)-(-34)-4=4-4=0

c) (-6)+5+(-4)+25=[(-6)+(-4)]+5+25=(-10)+5+25=(-5)+25=20

d) 33+34+35+36-13-14-15-16=(33-13)+(34-14)+(35-15)+(36-16)=20+20+20+20=80

 CHÚC BẠN HỌC TỐT~💯

a) 33-14-26-(-7)=[33-(-7)]-14-26=40-14-26=0

b) (-5)-25-(-34)-4=[(-5)-25]-(-34)-4=(-30)-(-34)-4=4-4=0

c) (-6)+5+(-4)+25=[(-6)+(-4)]+5+25=(-10)+5+25=(-5)+25=20

d) 33+34+35+36-13-14-15-16

=(33-13)+(34-14)+(35-15)+(36-16)

=20+20+20+20

=80

nhầm nữa đây mới đúng 

xin lỗi  rất nhiều

Câu 20 không cần làm hả bạn?

a,33-14-26-(-7)=33-14-26+7=19-26+7=(-7)+7=0

b,(-5)-25-(-34)-4=(-5)-25+34-4=(-30)+34-4=4-4=0

c,(-6)+5+(-4)+25=(-6)+5-4+25=(-1)+5-4+25=4-4+25=25

d,33+34+35+35+36-13-14-15-16=(33-13)+(34-14)+...+(36-16)

                                                     =20+20+20+20+20

                                                      =100

Bài 21
a, \(33-14-26-\left(-7\right)\)
\(=33+7-14-26\)
\(=40-14-26\)
\(=26-26=0\)

b, \(\left(-5\right)-25-\left(-34\right)-4\)
\(=\left(-5\right)+\left(-25\right)+34-4\)
\(=-30+30=0\)

c,\(\left(-6\right)+5+\left(-4\right)+25 \)
\(=\left(-6\right)+\left(-4\right)+\left(5+25\right)\)
\(=-10+30=20\)

d, \(33+34+35+36-13-14-15-16\)
\(=\left(33-13\right)+\left(34-14\right)+\left(35-15\right)+\left(36-16\right)\)
\(=20+20+20+20=80\)

V.

\(95^8< 100^8=10^{16}\)

Mà \(10^{16}\) có 17 chữ số nên \(95^8\) có ít hơn 17 chữ số (1)

Lại có: \(95^8>90^8=10^8.9^8=10^8.81^4>10^8.80^4=10^{12}.2^{12}>10^{12}.2^{10}>10^{12}.10^3=10^{15}\)

\(\Rightarrow95^8\) có nhiều hơn 15 chữ số  (2)

Từ (1) và (2) \(\Rightarrow95^8\) có 16 chữ số trong cách viết ở hệ thập phân

III.

1. Xét hiệu:

\(A-B=\dfrac{2019^{2020}+1}{2019^{2019}+1}-\dfrac{2019^{2019}+1}{2019^{2018}+1}=\dfrac{\left(2019^{2020}+1\right)\left(2019^{2018}+1\right)-\left(2019^{2019}+1\right)^2}{\left(2019^{2019}+1\right)\left(2019^{2018}+1\right)}\)

\(=\dfrac{2019^{4028}+1+2019^{2020}+2019^{2018}-2019^{4028}-2.2^{2019}-1}{\left(2019^{2019}+1\right)\left(2019^{2018}+1\right)}\)

\(=\dfrac{2019^{2020}-2019^{2019}+2019^{2018}-2019^{2019}}{\left(2019^{2019}+1\right)\left(2019^{2018}+1\right)}\)

\(=\dfrac{2019^{2019}\left(2019-1\right)-2019^{2018}\left(2019-1\right)}{\left(2019^{2019}+1\right)\left(2019^{2018}+1\right)}\)

\(=\dfrac{2018.2019^{2019}-2018.2019^{2018}}{\left(2019^{2019}+1\right)\left(2019^{2018}+1\right)}=\dfrac{2018.2019^{2018}\left(2019-1\right)}{\left(2019^{2019}+1\right)\left(2019^{2018}+1\right)}\)

\(=\dfrac{2018^2.2019^{2018}}{\left(2019^{2019}+1\right)\left(2019^{2018}+1\right)}>0\)

\(\Rightarrow A>B\)

III.

2.

Ta có: \(\dfrac{121}{122}< \dfrac{123}{124}\) ; \(\dfrac{123}{124}< \dfrac{124}{125}\);...; \(\dfrac{9023}{9024}< \dfrac{9024}{9025}\)

\(\Rightarrow A< \dfrac{122}{123}.\dfrac{124}{125}.\dfrac{126}{127}...\dfrac{9024}{9025}\)

\(\Rightarrow A.A< \left(\dfrac{121}{122}.\dfrac{123}{124}.\dfrac{125}{126}...\dfrac{9023}{9024}\right).\left(\dfrac{122}{123}.\dfrac{124}{125}.\dfrac{126}{127}...\dfrac{9024}{9025}\right)=\dfrac{121}{9025}\)

\(\Rightarrow A^2< \dfrac{121}{9025}\Rightarrow A< \dfrac{11}{95}\)

IV.1

\(\left\{{}\begin{matrix}AC+CB=AC=10\\AD+CB=13\end{matrix}\right.\) (1)

\(\Rightarrow AC+CB< AD+CB\)

\(\Rightarrow AC< AD\Rightarrow\) C nằm giữa A và D 

2.

Do C nằm giữa A và D \(\Rightarrow AC+CD=AD\)

\(\Rightarrow CD=AD-AC\)

Mặt khác, trừ vế cho vế (1) ta được:

\(AD+CB-\left(AC+CB\right)=13-10\)

\(\Rightarrow AD-AC=3\)

\(\Rightarrow CD=3\) (cm)

Ok, mk sẽ làm rõ ra cho bạn !

Bài 1: 25-(45-x)=13

                 45-x =25-13

                 45-x =12

                      x =45-12

                      x =33.

Bài 2: 10+(2x-4)=16

                  2x-4 =16-10

                  2x-4 =6

                  2x    =6+4

                  2x    =10

                   x     =10:2

                  x      =5

Bài 3: 24+3(5-x)=27

                 3(5-x)=27-24

                3(5-x)=3

                   5-x =3:3

                  5-x =1

                     x =5-1

                     x =4

Bài 1

\(25-\left(45-x\right)=13\)

\(45-x=25-13\)

\(45-x=12\)

\(x=45-12\)

\(x=33\)

Bài 2

\(10+\left(2x-4\right)=16\)

\(2x-4=16-10\)

\(2x-4=6\)

\(2x=10\)

\(x=10:2\)

\(x=5\)

Bài 3

\(24+3\left(5-x\right)=27\)

\(27\left(5-x\right)=27\)

\(5-x=27:27\)

\(5-x=1\)

\(x=5-1\)

\(x=4\)

Chi tiết lắm rồ đóa !!!

1) are eatting ....

2)are talking...

3)Ha is writing...

4)are playing...

5)is drawing...

4)

mn ơi mn giúp mình với ạ

1) Are your friend swimming 

yes, it is

2)Are they listen to music

yes, they are

1m25cm=125cm

1m25cm=1,25m

0,02

0,35

0,024

0,02

7,0068

6,5

1,25

10025

0,25

0,45

0,78

0,35

13025

0,438

0,02

0,35

0,024

0,02

7,0068

6,5

1,25

10025

0,25

0,45

0,78

0,35

13025

0,438

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