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23 tháng 2 2022
a: x=5/6-1/2=1/3
b: x=3/4-1/4=1/2
c: x=3/10+1/5=1/2
d: x=5/6-1/3=1/2
e: x=1/2-3/10=5/10-3/10=2/10=1/5
f: x=3/8-1/4=1/8
6 tháng 1 2024
Bài 2:
1: 3x-1,7=1,5*3
=>3x-1,7=4,5
=>3x=4,5+1,7=6,2
=>\(x=\dfrac{6.2}{3}=\dfrac{62}{30}=\dfrac{31}{15}\)
2: \(2x-15=35\cdot\left(-1\right)^{10}\)
=>2x-15=35
=>2x=35+15=50
=>x=50/2=25
3: \(\dfrac{x}{-12}=\dfrac{-20}{6}\)
=>\(\dfrac{x}{12}=\dfrac{20}{6}=\dfrac{10}{3}\)
=>\(x=\dfrac{10}{3}\cdot12=10\cdot4=40\)
4: \(\dfrac{1}{4}x-50\%x=-1\dfrac{3}{4}\)
=>\(\dfrac{1}{4}x-\dfrac{1}{2}x=-\dfrac{7}{4}\)
=>\(-\dfrac{1}{4}x=-\dfrac{7}{4}\)
=>x=7
5: \(\dfrac{x}{1\cdot2}+\dfrac{x}{2\cdot3}+...+\dfrac{x}{99\cdot100}=\left(-10\right)^2\)
=>\(x\left(\dfrac{1}{1\cdot2}+\dfrac{1}{2\cdot3}+...+\dfrac{1}{99\cdot100}\right)=100\)
=>\(x\left(1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+...+\dfrac{1}{99}-\dfrac{1}{100}\right)=100\)
=>\(x\left(1-\dfrac{1}{100}\right)=100\)
=>\(x\cdot\dfrac{99}{100}=100\)
=>\(x=100:\dfrac{99}{100}=\dfrac{10000}{99}\)
Bài 1:
1: \(\dfrac{1}{4}+\left(\dfrac{1}{2022}+\dfrac{3}{4}\right)\)
\(=\dfrac{1}{4}+\dfrac{1}{2022}+\dfrac{3}{4}\)
\(=1+\dfrac{1}{2022}=\dfrac{2023}{2022}\)
2: \(\dfrac{3}{19}\cdot\dfrac{-5}{17}+\dfrac{3}{19}\cdot\dfrac{-12}{17}+2022\dfrac{3}{19}\)
\(=\dfrac{3}{19}\left(-\dfrac{5}{17}-\dfrac{12}{17}\right)+2022+\dfrac{3}{19}\)
\(=-\dfrac{3}{19}+\dfrac{3}{19}+2022=2022\)
3: \(2,86\cdot4+3,14\cdot4-6,01\cdot5+3^2\cdot\left(-1\right)^{20}\)
\(=4\left(2,86+3,14\right)-30,05+9\)
\(=4\cdot6-30,05+9\)
=2,95
4: \(2,5\left(4,1-3-2,5+2\cdot7,2\right)+4,2:4\)
\(=2,5\left(1,1-2,5+14,4\right)+1,05\)
\(=2,5\cdot13+1,05=32,5+1,05=33,55\)
NM
1
15 tháng 3 2022
Chiều cao mảnh vườn là:
12 x \(\dfrac{2}{3}\) = 8 (m)
Diện tích mảnh vườn là:
12 x 8 = 96 ( m2)
ĐS: 96 m2
8 tháng 12 2021
\(\Leftrightarrow x+3\in\left\{1;-1;2;-2;4;-4\right\}\)
hay \(x\in\left\{-2;-4;-1;-5;1;-7\right\}\)
NK
25 tháng 8 2016
Nam và nữ có thể cư xử .......... trong tình huống này.
(Sự khác biệt)
73.prefers
74.b
75.b
76.How long did the TV station broadcast the program?
77.They should put a chair between the table and the sofa.
78.Let
79.way
80.later
81.D
82.We have Biology lessons twice a week.
83.Why does Mr.John worry about his son's study?
84.distance
193.You ought not to watch TV too late.
194.Would you like to go somewhere with me?
195.taking
196.( tu nay co trong sach giao khoa, ban xem lai nha, minh ko nho lam)
197.the sports
198.character
199.Nam enjoys going to Nha Trang on his vacation.
200.Children should spend only a small part of their free time playing electric games.