Bài 1 :

\(A=2+2^2+2^3+2^4+...+2^{118}+2^{119}+2^{120}\)

\(\Rightarrow A=2\left(1+2^{ }+2^2\right)+2^4\left(1+2^{ }+2^2\right)+...+2^{118}\left(1+2^{ }+2^2\right)\)

\(\Rightarrow A=2.7+2^4.7+...+2^{118}.7\)

\(\Rightarrow A=7.\left(2+2^4+...+2^{118}\right)⋮7\)

\(\Rightarrow dpcm\)

Bài 2 :

\(...=23\left(78+22\right)-15=23.100-15=2300-15=2285\)

ko bt bài 1

bài 2 là

=23.(78+22)-15

=23.100-15

=2300-15

=2275

hết

\(A=\left(2^5\cdot2^7\right):2^{10}+5\cdot3^4-6^3:6\\ =2^{12}:2^{10}+5\cdot3^4-6^2\\ =2^2+5\cdot3^4-36\\ =4+405-36\\ =373\\ B=\left(5^2-3\right):11\\ =\left(25-3\right):11\\ =22:11\\ =2\\ C=\left(5^{2022}-5^{2021}\right):5^{2021}\\ =5^{2021}\cdot\left(5-1\right):5^{2021}\\ =4\\ D=\left(7^{20}-7^{19}\right):7^{19}\\ =7^{19}\cdot\left(7-1\right):7^{19}\\ =6\)

đợi tí

\(A=4^3-6^3:6^2+11\cdot3^2\\ =64-6+11\cdot9\\ =58+99\\ =157\\ B=5\cdot35-5^2\cdot2\\ =5\cdot\left(35-10\right)\\ =5\cdot25\\ =125\\ C=\left(7-3^3:3^2\right):2^2+99\\ =\left(7-3\right):4+99\\ =4:4+99\\ =1+99=100\\ D=2^7:2^2+5^4:5^3\cdot2^4-3\cdot2^5\\ =2^5+5\cdot2^4-6\cdot2^4\\ =2^4\cdot\left(2+5-6\right)\\ =2^4\\ =16\)

đợi tý

đợi tý

a) 182

b) 248

c) 2

d) 384

\(A=3\cdot5^2-4\cdot2^3\\ =3\cdot25-4\cdot8\\ =75-32\\ =43\\ B=3\cdot5^2+3:5^0-48:2^3\\ =3\cdot25+3-48:8\\ =75+3-6\\ =72\\ C=120+40:4-3\cdot5^2\\ =120+10-75\\ =55\\ D=5\cdot2^3-36:3^2\\ =5\cdot8-36:9\\ =40-4\\ =36\)

bài này dễ mà bạn bạn chỉ cần đổi ra rồi tính bình thường là đc mà

Bài 1:

\(A=2^2\cdot3-4\\ =4\cdot3-4\\ =4\cdot\left(3-1\right)\\ =4\cdot2\\ =8\\ B=16-2^3\cdot2\\ =16-16\\ =0\\ C=4^2-4\cdot2\\ =4\cdot\left(4-2\right)\\ =4\cdot2\\ =8\\ D=3^3-3\cdot3^2\\ =3^3-3^3\\ =0\)

    3ⁿ . 3² = 81

⇒ 3ⁿ . 3² = 3⁴

⇒   3^{n + 2} = 3⁴

⇒    n + 2 = 4

⇒         n = 2

Yêu cầu đề bài là gì bạn?

đề bài j mà vô lí z bạn

1)

a) \(...=4^4-225=256-225=31\)

b) \(...=8.9.5+120=360-120=240\)

c) \(...=3^4-3^3=81-27=54\)

d) \(...=7^2-1=49-1=48\)

2) a) \(...=2^6=64\)

b) \(...=3^{15}:3^{10}=3^5=243\)

c) \(...=3^3-3^3=0\)

d) \(...=6^3+4^5=216+1024=1240\)

1. a) 31

    b) 480

    c) 48

    d) 348

2. a) 64

    b) 243

    c) 0

    d) 1240

hdsghj

Bài 1 :

a) \(...=5^5:5^4=5\)

b) \(...=7^8:7^9=\dfrac{1}{7}\)

c) \(...=2^{15}:\left(2^6.2^5\right)=2^{15}:2^{11}=2^4=16\)

d) \(...=3^{28}:3^{26}=3^2=9\)

Bài 2 :

a) \(...=3^2.3^3:3^4=3^5:3^4=3\)

b) \(...=10^9-10^9=0\)

c) \(...=5^{10}.5^{30}:5^{12}=5^{40}:5^{12}=5^{28}\)