1: 2*2*2*2*2*2=2^6

2: x*x*x*x=x^4

3: =7^4*6^4=42^4

4: =5^2*3^2*4^2=60^2

5: =2*3^2*5^5

6: =10^3*10^3=10^6

a,  3^9:3^2=3^7

b,  (3/5)^15:(3/5)^10=(3/5)^5

c,  (5.3.3)^10.5^10 / (5.5.3)^10=5^10.3^10.3^10.5^10 / 5^10.5^10.3^10=5^20.3^20 / 5^20.3^10=3^10

\(1,\\ x+\dfrac{1}{2}=-\dfrac{5}{3}\\ x=-\dfrac{5}{3}-\dfrac{1}{2}\\ x=-\dfrac{13}{6}\\ Vậyx=-\dfrac{13}{6}\)

\(2,\\ \dfrac{1}{3}-x=\dfrac{3}{5}\\ x=\dfrac{1}{3}-\dfrac{3}{5}\\ x=-\dfrac{4}{15}\\ Vậyx=-\dfrac{4}{15}\)

\(3,\\ 3-4+x=\dfrac{7}{2}\\ -1+x=\dfrac{7}{2}\\ x=\dfrac{7}{2}+1\\ x=\dfrac{9}{2}\\ Vậyx=\dfrac{9}{2}\)

\(4,\\ x-\dfrac{4}{3}=-\dfrac{7}{9}\\ x=-\dfrac{7}{9}+\dfrac{4}{3}\\ x=\dfrac{15}{27}\\ Vậyx=\dfrac{15}{27}\)

\(5,\\ x-\left(-\dfrac{7}{3}\right)=\dfrac{5}{6}\\ x=\dfrac{5}{6}-\dfrac{7}{3}\\ x=-\dfrac{27}{18}\\ Vậyx=-\dfrac{27}{18}\)

\(6,\\ x-\dfrac{1}{5}=\dfrac{9}{10}\\ x=\dfrac{9}{10}+\dfrac{1}{5}\\ x=\dfrac{11}{10}\\ Vậyx=\dfrac{11}{10}\)

\(7,\\ x+\dfrac{5}{12}=\dfrac{3}{8}\\ x=\dfrac{3}{8}-\dfrac{5}{12}\\ x=-\dfrac{1}{24}\\ Vậyx=-\dfrac{1}{24}\)

\(8,\\ x+\dfrac{5}{4}=\dfrac{7}{6}\\ x=\dfrac{7}{6}-\dfrac{5}{4}\\ x=-\dfrac{9}{24}\\ Vậyx=-\dfrac{9}{24}\)

\(9,\\ x-\dfrac{2}{7}=\dfrac{1}{35}\\ x=\dfrac{1}{35}+\dfrac{2}{7}\\ x=\dfrac{11}{35}\\ Vậyx=\dfrac{11}{35}\\ 10,\\ x-\dfrac{1}{5}=-\dfrac{7}{10}\\ x=-\dfrac{7}{10}+\dfrac{1}{5}\\ x=-\dfrac{1}{2}\\ Vậyx=-\dfrac{1}{2}\)

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a) \(\dfrac{1}{2}+x=\dfrac{5}{6}\)

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

b) \(x+\dfrac{1}{4}=\dfrac{3}{4}\)

\(\Rightarrow x=\dfrac{3}{4}-\dfrac{1}{4}=\dfrac{2}{4}=\dfrac{1}{2}\)

c) \(x-\dfrac{1}{5}=\dfrac{3}{10}\)

\(\Rightarrow x=\dfrac{3}{10}+\dfrac{1}{5}=\dfrac{3}{10}+\dfrac{2}{10}=\dfrac{5}{10}=\dfrac{1}{2}\)

d) \(\dfrac{5}{6}-x=\dfrac{1}{3}\)

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

e) \(\dfrac{3}{10}+x=\dfrac{1}{2}\)

\(\Rightarrow x=\dfrac{1}{2}-\dfrac{3}{10}=\dfrac{5}{10}-\dfrac{3}{10}=\dfrac{2}{10}=\dfrac{1}{5}\)

g) \(x+\dfrac{1}{4}=\dfrac{3}{8}\)

\(\Rightarrow x=\dfrac{3}{8}-\dfrac{1}{4}=\dfrac{3}{8}-\dfrac{2}{8}=\dfrac{1}{8}\)

a) ⇒x=56−12=56−36=26=13⇒x=56−12=56−36=26=13

b) ⇒x=34−14=24=12⇒x=34−14=24=12

c) ⇒x=310+15=310+210=510=12⇒x=310+15=310+210=510=12

d) ⇒x=56−13=56−26=36=12⇒x=56−13=56−26=36=12

e) ⇒x=12−310=510−310=210=15⇒x=12−310=510−310=210=15

g) ⇒x=38−14=38−28=18⇒x=38−14=38−28=18

Đọc tiếp

a) ⇒x=56−12=56−36=26=13⇒x=56−12=56−36=26=13

b) ⇒x=34−14=24=12⇒x=34−14=24=12

c) ⇒x=310+15=310+210=510=12⇒x=310+15=310+210=510=12

d) ⇒x=56−13=56−26=36=12⇒x=56−13=56−26=36=12

e) ⇒x=12−310=510−310=210=15⇒x=12−310=510−310=210=15

g) ⇒x=38−14=38−28=18⇒x=38−14=38−28=18

17100

ai giải hộ mình mình k liền

Giúp mk với!!!!

1) -10 < x < 10

Gọi tập hợp trên là A: Các phần tử của tập A là:

A = { -9;-8;-7;-6;-5;-4;-3;-2;-1;0;1;2;3;4;5;6;7;8;9}

Tổng các phần tử tập hợp A là: (-9) + (-8) + (-7) + (-6) + (-5) + (-4) + (-3) + (-2) + (-1) + 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9

= [(-9) + 9] + [(-8) + 8] + [(-7) + 7] + [(-6) + 6] + [(-5) + 5] + [(-4) + 4] + [(-3) + 3] + [(-2) + 2] + [(-1) + 1]

= 0 + 0 + 0 + 0 + ... + 0 (9 số 0)

= 0

2) -5 ≤ x < 5

Gọi tập hợp trên là B, theo đề bài trên, tập hợp B có số phần tử là: 

B = {-5;-4;-3;-2;-1;0;1;2;3;4}

Tổng các phần tử của tập B là: (-5) + (-4) + (-3) + (-2) + (-1) + 0 + 1 + 2 + 3 + 4

= [(-4) + 4] + [(-3) + 3] + [(-2) + 2] + [(-1) + 1] + (-5)

= 0 + 0 + 0 + 0 + (-5)

= (-5)

= 1.2.3.(1+2+5) / 2.3.5.(1+2+5)

= 1.2.3/2.3.5 = 1/5

Ta có : 1.2.3.(1+2^3+5^3)/2.3.5.(1+2^3+5^3) = 1.2.3/2.3.5 = 1/5